# What is CVE-2021-22786? > CVE-2021-22786 is a high-severity flaw (CVSS 7.5) in Modicon M340 Bmxp341000 Firmware from Schneider-Electric, published on 1 February 2023. 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 0.6%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-22786 ## 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:** 47 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:** 0.6% (latest exploit-likelihood forecast) - **Published:** 1 February 2023 - **Record last updated:** 8 February 2023 - **Main product:** Modicon M340 Bmxp341000 Firmware from Schneider-Electric - **Affected products:** 82 ## What is CVE-2021-22786? 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 read data. ### The official description A CWE-200: Information Exposure vulnerability exists that could cause the exposure of sensitive information stored on the memory of the controller when communicating over the Modbus TCP protocol. Affected Products: Modicon M340 CPU (part numbers BMXP34*) (Versions prior to V3.30), Modicon M580 CPU (part numbers BMEP* and BMEH*) (Versions prior to SV3.20), Modicon MC80 (BMKC80) (Versions prior to V1.6), Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) (All Versions), Modicon Momentum MDI (171CBU*) (Versions prior to V2.3), Legacy Modicon Quantum (All Versions) ### What kind of flaw is it? - CWE-200: Exposure of Sensitive Information to an Unauthorized Actor ### 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 read data Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N` ## Is CVE-2021-22786 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 0.6%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.6%, 0.6%, 0.6%, 0.6%, 0.6%, 0.6%, 0.6%. ### Timeline - 1 February 2023: Published - 8 February 2023: Record last updated ### How Precursor Intelligence ranks it CVE-2021-22786 scores **47 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-2021-22786? The published record lists 82 products. Versions are as published: "before 3.40" means every version up to, but not including, 3.40. - [Modicon M340 Bmxp341000 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp341000_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp341000](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp341000) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342000](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342000) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342000 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342000_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp342010](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342010) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342010 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342010_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp3420102](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420102) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp3420102 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420102_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp342020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp342020h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342020h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342020h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342020h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp342030](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342030) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342030 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342030_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp3420302](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420302) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp3420302 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420302_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp3420302h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420302h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp3420302h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420302h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M340 Bmxp342030h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342030h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M340 Bmxp342030h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342030h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.40 - [Modicon M580 Bmeh582040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh582040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh582040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh582040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh582040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh582040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh584040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh584040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh584040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh584040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh584040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh584040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh586040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh586040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh586040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh586040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmeh586040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmeh586040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep581020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep581020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep581020h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep581020h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep582020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep582020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep582020h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep582020h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep582040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep582040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep582040h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep582040h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep582040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep582040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep583020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep583020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep583040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep583040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep584020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep584020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep584040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep584040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep584040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep584040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep585040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep585040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep585040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep585040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep586040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep586040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon M580 Bmep586040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon M580 Bmep586040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): up to 3.20 - [Modicon Mc80 Bmkc8020301](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8020301) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon Mc80 Bmkc8020301 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8020301_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 1.70 - [Modicon Mc80 Bmkc8020310](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8020310) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon Mc80 Bmkc8020310 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8020310_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 1.70 - [Modicon Mc80 Bmkc8030311](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8030311) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon Mc80 Bmkc8030311 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8030311_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 1.70 - [Modicon Momentum 171cbu78090](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu78090) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon Momentum 171cbu78090 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu78090_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 2.4 - [Modicon Momentum 171cbu98090](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu98090) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon Momentum 171cbu98090 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu98090_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 2.4 - [Modicon Momentum 171cbu98091](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu98091) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified - [Modicon Momentum 171cbu98091 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu98091_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 2.4 ## How do I fix CVE-2021-22786? 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 - [download.schneider-electric.com](https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-221-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-221-04-Modicon_Controllers_Ethernet_Modules_Security_Notification.pdf) (Patch, Vendor advisory) ## Questions ### What is CVE-2021-22786? CVE-2021-22786 is a high-severity flaw in Modicon M340 Bmxp341000 Firmware from Schneider-Electric, published on 1 February 2023. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data. ### How serious is CVE-2021-22786? It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2021-22786 is 47 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-2021-22786 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 0.6%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2021-22786 affect? For Modicon M340 Bmxp341000 Firmware from Schneider-Electric: before 3.40. The record lists 82 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2021-22786? 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-2021-22786 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