# What is CVE-2019-13933? > CVE-2019-13933 is a high-severity flaw (CVSS 8.6) in Scalance X204rna from Siemens, published on 16 January 2020. 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 1.4%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-13933 ## 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:** 49 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** High (CVSS 8.6 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:** 1.4% (latest exploit-likelihood forecast) - **Published:** 16 January 2020 - **Record last updated:** 13 December 2022 - **Main product:** Scalance X204rna from Siemens - **Affected products:** 14 ## What is CVE-2019-13933? 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 change data. ### The official description A vulnerability has been identified in SCALANCE X204RNA (HSR), SCALANCE X204RNA (PRP), SCALANCE X204RNA EEC (HSR), SCALANCE X204RNA EEC (PRP), SCALANCE X204RNA EEC (PRP/HSR), SCALANCE X302-7 EEC (230V), SCALANCE X302-7 EEC (230V, coated), SCALANCE X302-7 EEC (24V), SCALANCE X302-7 EEC (24V, coated), SCALANCE X302-7 EEC (2x 230V), SCALANCE X302-7 EEC (2x 230V, coated), SCALANCE X302-7 EEC (2x 24V), SCALANCE X302-7 EEC (2x 24V, coated), SCALANCE X304-2FE, SCALANCE X306-1LD FE, SCALANCE X307-2 EEC (230V), SCALANCE X307-2 EEC (230V, coated), SCALANCE X307-2 EEC (24V), SCALANCE X307-2 EEC (24V, coated), SCALANCE X307-2 EEC (2x 230V), SCALANCE X307-2 EEC (2x 230V, coated), SCALANCE X307-2 EEC (2x 24V), SCALANCE X307-2 EEC (2x 24V, coated), SCALANCE X307-3, SCALANCE X307-3, SCALANCE X307-3LD, SCALANCE X307-3LD, SCALANCE X308-2, SCALANCE X308-2, SCALANCE X308-2LD, SCALANCE X308-2LD, SCALANCE X308-2LH, SCALANCE X308-2LH, SCALANCE X308-2LH+, SCALANCE X308-2LH+, SCALANCE X308-2M, SCALANCE X308-2M, SCALANCE X308-2M PoE, SCALANCE X308-2M PoE, SCALANCE X308-2M TS, SCALANCE X308-2M TS, SCALANCE X310, SCALANCE X310, SCALANCE X310FE, SCALANCE X310FE, SCALANCE X320-1 FE, SCALANCE X320-1-2LD FE, SCALANCE X408-2, SCALANCE XR324-12M (230V, ports on front), SCALANCE XR324-12M (230V, ports on front), SCALANCE XR324-12M (230V, ports on rear), SCALANCE XR324-12M (230V, ports on rear), SCALANCE XR324-12M (24V, ports on front), SCALANCE XR324-12M (24V, ports on front), SCALANCE XR324-12M (24V, ports on rear), SCALANCE XR324-12M (24V, ports on rear), SCALANCE XR324-12M TS (24V), SCALANCE XR324-12M TS (24V), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (24V, ports on front), SCALANCE XR324-4M EEC (24V, ports on front), SCALANCE XR324-4M EEC (24V, ports on rear), SCALANCE XR324-4M EEC (24V, ports on rear), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (2x 24V, ports on front), SCALANCE XR324-4M EEC (2x 24V, ports on front), SCALANCE XR324-4M EEC (2x 24V, ports on rear), SCALANCE XR324-4M EEC (2x 24V, ports on rear), SCALANCE XR324-4M PoE (230V, ports on front), SCALANCE XR324-4M PoE (230V, ports on rear), SCALANCE XR324-4M PoE (24V, ports on front), SCALANCE XR324-4M PoE (24V, ports on rear), SCALANCE XR324-4M PoE TS (24V, ports on front), SIPLUS NET SCALANCE X308-2. Affected devices contain a vulnerability that allows an unauthenticated attacker to violate access-control rules. The vulnerability can be triggered by sending GET request to specific uniform resource locator on the web configuration interface of the device. The security vulnerability could be exploited by an attacker with network access to the affected systems. An attacker could use the vulnerability to obtain sensitive information or change the device configuration. At the time of advisory publication no public exploitation of this security vulnerability was known. ### What kind of flaw is it? - CWE-306: Missing Authentication for Critical Function ### 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 change data Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L` ## Is CVE-2019-13933 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 1.4%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 1.4%, 1.4%, 1.4%, 1.4%, 1.4%, 1.4%, 1.4%. ### Timeline - 16 January 2020: Published - 13 December 2022: Record last updated ### How Precursor Intelligence ranks it CVE-2019-13933 scores **49 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-2019-13933? The published record lists 14 products. Versions are as published: "before 4.1.3" means every version up to, but not including, 4.1.3. - [Scalance X204rna](https://www.precursorintelligence.com/product/siemens/scalance_x204rna) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X-200rna](https://www.precursorintelligence.com/product/siemens/scalance_x-200rna) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X-200rna Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x-200rna_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): all versions - [Scalance X-300](https://www.precursorintelligence.com/product/siemens/scalance_x-300) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X-300 Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x-300_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.1.3 - [Scalance X204rna Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x204rna_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): all versions - [Scalance X408-2](https://www.precursorintelligence.com/product/siemens/scalance_x408-2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance X408-2 Firmware](https://www.precursorintelligence.com/product/siemens/scalance_x408-2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.1.3 - [Scalance XR-300](https://www.precursorintelligence.com/product/siemens/scalance_xr-300) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance XR-300 Firmware](https://www.precursorintelligence.com/product/siemens/scalance_xr-300_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.1.3 - [Scalance XR-300wg](https://www.precursorintelligence.com/product/siemens/scalance_xr-300wg) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Scalance XR-300wg Firmware](https://www.precursorintelligence.com/product/siemens/scalance_xr-300wg_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.1.3 - [Siplus Net Csm 1277](https://www.precursorintelligence.com/product/siemens/siplus_net_csm_1277) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Siplus Net Csm 1277 Firmware](https://www.precursorintelligence.com/product/siemens/siplus_net_csm_1277_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.1.3 ## How do I fix CVE-2019-13933? 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-443566.pdf) (Vendor advisory) - [us-cert.gov](https://www.us-cert.gov/ics/advisories/icsa-20-014-03) (Third-party advisory) ## Questions ### What is CVE-2019-13933? CVE-2019-13933 is a high-severity flaw in Scalance X204rna from Siemens, published on 16 January 2020. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can change data. ### How serious is CVE-2019-13933? It scores 8.6 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2019-13933 is 49 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-2019-13933 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 1.4%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2019-13933 affect? For Scalance X204rna from Siemens: version not specified. The record lists 14 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2019-13933? 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-2019-13933 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