# What is CVE-2021-37185? > CVE-2021-37185 is a high-severity flaw (CVSS 7.5) in Tim 1531 Irc from Siemens, published on 9 February 2022. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 2.1%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-37185 ## At a glance - **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle. - **Precursor Intelligence risk score:** 40 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** High (CVSS 7.5 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 2.1% (latest exploit-likelihood forecast) - **Published:** 9 February 2022 - **Record last updated:** 11 April 2023 - **Main product:** Tim 1531 Irc from Siemens - **Affected products:** 95 ## What is CVE-2021-37185? In plain terms It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline. ### The official description A vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 = V21.9 = V4.5.0 = V2.9.2 = V21.9 = V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over port 102/tcp. A restart of the affected device is needed to restore normal operations. ### What kind of flaw is it? - CWE-672: Operation on a Resource after Expiration or Release ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Easy: no special conditions - Login needed first: No login needed - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can take it offline Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` ## Is CVE-2021-37185 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 2.1%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 2.1%, 2.1%, 2.1%, 2.1%, 2.1%, 2.1%, 2.1%. ### Timeline - 9 February 2022: Published - 11 April 2023: Record last updated ### How Precursor Intelligence ranks it CVE-2021-37185 scores **40 out of 100 (Medium)**, with the action "Plan remediation". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: smaller factor - Threat activity around it: smaller factor 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2021-37185? The published record lists 95 products. Versions are as published: "before 4.0" means every version up to, but not including, 4.0. - [Tim 1531 Irc](https://www.precursorintelligence.com/product/siemens/tim_1531_irc) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-Plcsim Advanced Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-plcsim_advanced_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.0, 4.0 - [Simatic Drive Controller CPU 1504d Tf](https://www.precursorintelligence.com/product/siemens/simatic_drive_controller_cpu_1504d_tf) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic Drive Controller CPU 1504d Tf Firmware](https://www.precursorintelligence.com/product/siemens/simatic_drive_controller_cpu_1504d_tf_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.9.4 - [Simatic Drive Controller CPU 1507d Tf](https://www.precursorintelligence.com/product/siemens/simatic_drive_controller_cpu_1507d_tf) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic Drive Controller CPU 1507d Tf Firmware](https://www.precursorintelligence.com/product/siemens/simatic_drive_controller_cpu_1507d_tf_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.9.4 - [Simatic Et 200sp Open Controller CPU 1515sp Pc2](https://www.precursorintelligence.com/product/siemens/simatic_et_200sp_open_controller_cpu_1515sp_pc2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic Et 200sp Open Controller CPU 1515sp Pc2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): all versions - [Simatic S7-1200 CPU 1211c](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1211c) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1211c Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1211c_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1212c](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1212c) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1212c Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1212c_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1212fc](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1212fc) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1212fc Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1212fc_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1214c](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1214c) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1214c Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1214c_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1214fc](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1214fc) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1214fc Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1214fc_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1215c](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1215c) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1215c Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1215c_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1215fc](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1215fc) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1215fc Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1215fc_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1200 CPU 1217c](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1217c) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1200 CPU 1217c Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_cpu_1217c_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 4.5.0 to before 4.5.2 - [Simatic S7-1500 CPU 1510sp](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1510sp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1510sp Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1510sp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1510sp-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1510sp-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1510sp-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1510sp-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1511-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1511-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1511c-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511c-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1511c-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511c-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1511f-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511f-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1511f-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511f-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1511t-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511t-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1511t-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511t-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1511tf-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511tf-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1511tf-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511tf-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1512c-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1512c-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1512c-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1512c-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1512sp-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1512sp-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1512sp-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1512sp-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1512spf-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1512spf-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1512spf-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1512spf-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1513-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1513-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1513f-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513f-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1513f-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513f-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1513r-1](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513r-1) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1513r-1 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513r-1_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1515-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1515-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1515f-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515f-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1515f-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515f-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1515r-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515r-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1515r-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515r-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1515t-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515t-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1515t-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515t-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1515tf-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515tf-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1515tf-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515tf-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1516-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1516-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1516f-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516f-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1516f-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516f-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1516pro F](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516pro_f) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1516pro F Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516pro_f_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1516pro-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516pro-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1516pro-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516pro-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1516t-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516t-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1516t-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516t-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1516tf-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516tf-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1516tf-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516tf-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1517-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1517-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1517f-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517f-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1517f-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517f-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1517tf-3](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517tf-3) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1517tf-3 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517tf-3_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1518-4](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518-4) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1518-4 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518-4_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1518f-4](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518f-4) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1518f-4 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518f-4_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1518hf-4](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518hf-4) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1518hf-4 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518hf-4_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1518t-4](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518t-4) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1518t-4 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518t-4_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU 1518tf-4](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518tf-4) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU 1518tf-4 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518tf-4_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU CPU 1513pro-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_cpu_1513pro-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU CPU 1513pro-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_cpu_1513pro-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 CPU CPU 1513prof-2](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_cpu_1513prof-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic S7-1500 CPU CPU 1513prof-2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_cpu_1513prof-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.9.2 to before 2.9.4 - [Simatic S7-1500 Software Controller](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_software_controller) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): all versions - [Simatic S7-Plcsim Advanced](https://www.precursorintelligence.com/product/siemens/simatic_s7-plcsim_advanced) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Tim 1531 Irc Firmware](https://www.precursorintelligence.com/product/siemens/tim_1531_irc_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.2 and later ## How do I fix CVE-2021-37185? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf) (Patch, Vendor advisory) ## Questions ### What is CVE-2021-37185? CVE-2021-37185 is a high-severity flaw in Tim 1531 Irc from Siemens, published on 9 February 2022. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline. ### How serious is CVE-2021-37185? It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2021-37185 is 40 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2021-37185 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 2.1%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2021-37185 affect? For Tim 1531 Irc from Siemens: version not specified. The record lists 95 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2021-37185? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2021-37185 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact