# CVE-2021-37209: Weak cryptography in RUGGEDCOM M2100 > Weak cryptographic implementation in Siemens RUGGEDCOM devices allows attackers to potentially read sensitive data. - **Severity:** Medium 6.7 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H/E:P/RL:U/RC:C`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** A user has to click or open something - **Fix available:** No - **Published:** 8 Mar 2022 - **Updated:** 12 Aug 2025 - **Also known as:** GHSA-283q-3r3x-g3rc ## What is CVE-2021-37209? CVE-2021-37209 is a medium-severity vulnerability in Siemens RUGGEDCOM M2100, published on 8 Mar 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link. ### Official description A vulnerability has been identified in RUGGEDCOM i800 (All versions < V4.3.8), RUGGEDCOM i801 (All versions < V4.3.8), RUGGEDCOM i802 (All versions < V4.3.8), RUGGEDCOM i803 (All versions < V4.3.8), RUGGEDCOM M2100 (All versions < V4.3.8), RUGGEDCOM M2200 (All versions < V4.3.8), RUGGEDCOM M969 (All versions < V4.3.8), RUGGEDCOM RMC30 (All versions < V4.3.8), RUGGEDCOM RMC8388 V4.X (All versions < V4.3.8), RUGGEDCOM RMC8388 V5.X (All versions < V5.7.0), RUGGEDCOM RP110 (All versions < V4.3.8), RUGGEDCOM RS1600 (All versions < V4.3.8), RUGGEDCOM RS1600F (All versions < V4.3.8), RUGGEDCOM RS1600T (All versions < V4.3.8), RUGGEDCOM RS400 (All versions < V4.3.8), RUGGEDCOM RS401 (All versions < V4.3.8), RUGGEDCOM RS416 (All versions < V4.3.8), RUGGEDCOM RS416P (All versions < V4.3.8), RUGGEDCOM RS416Pv2 V4.X (All versions < V4.3.8), RUGGEDCOM RS416Pv2 V5.X (All versions < V5.7.0), RUGGEDCOM RS416v2 V4.X (All versions < V4.3.8), RUGGEDCOM RS416v2 V5.X (All versions < V5.7.0), RUGGEDCOM RS8000 (All versions < V4.3.8), RUGGEDCOM RS8000A (All versions < V4.3.8), RUGGEDCOM RS8000H (All versions < V4.3.8), RUGGEDCOM RS8000T (All versions < V4.3.8), RUGGEDCOM RS900 (All versions < V4.3.8), RUGGEDCOM RS900 (32M) V4.X (All versions < V4.3.8), RUGGEDCOM RS900 (32M) V5.X (All versions < V5.7.0), RUGGEDCOM RS900G (All versions < V4.3.8), RUGGEDCOM RS900G (32M) V4.X (All versions < V4.3.8), RUGGEDCOM RS900G (32M) V5.X (All versions < V5.7.0), RUGGEDCOM RS900GP (All versions < V4.3.8), RUGGEDCOM RS900L (All versions < V4.3.8), RUGGEDCOM RS900M-GETS-C01 (All versions < V4.3.8), RUGGEDCOM RS900M-GETS-XX (All versions < V4.3.8), RUGGEDCOM RS900M-STND-C01 (All versions < V4.3.8), RUGGEDCOM RS900M-STND-XX (All versions < V4.3.8), RUGGEDCOM RS900W (All versions < V4.3.8), RUGGEDCOM RS910 (All versions < V4.3.8), RUGGEDCOM RS910L (All versions < V4.3.8), RUGGEDCOM RS910W (All versions < V4.3.8), RUGGEDCOM RS920L (All versions < V4.3.8), RUGGEDCOM RS920W (All versions < V4.3.8), RUGGEDCOM RS930L (All versions < V4.3.8), RUGGEDCOM RS930W (All versions < V4.3.8), RUGGEDCOM RS940G (All versions < V4.3.8), RUGGEDCOM RS969 (All versions < V4.3.8), RUGGEDCOM RSG2100 (All versions < V4.3.8), RUGGEDCOM RSG2100 (32M) V4.X (All versions < V4.3.8), RUGGEDCOM RSG2100 (32M) V5.X (All versions < V5.7.0), RUGGEDCOM RSG2100P (All versions < V4.3.8), RUGGEDCOM RSG2100P (32M) V4.X (All versions < V4.3.8), RUGGEDCOM RSG2100P (32M) V5.X (All versions < V5.7.0), RUGGEDCOM RSG2200 (All versions < V4.3.8), RUGGEDCOM RSG2288 V4.X (All versions < V4.3.8), RUGGEDCOM RSG2288 V5.X (All versions < V5.7.0), RUGGEDCOM RSG2300 V4.X (All versions < V4.3.8), RUGGEDCOM RSG2300 V5.X (All versions < V5.7.0), RUGGEDCOM RSG2300P V4.X (All versions < V4.3.8), RUGGEDCOM RSG2300P V5.X (All versions < V5.7.0), RUGGEDCOM RSG2488 V4.X (All versions < V4.3.8), RUGGEDCOM RSG2488 V5.X (All versions < V5.7.0), RUGGEDCOM RSG907R (All versions < V5.7.0), RUGGEDCOM RSG908C (All versions < V5.7.0), RUGGEDCOM RSG909R (All versions < V5.7.0), RUGGEDCOM RSG910C (All versions < V5.7.0), RUGGEDCOM RSG920P V4.X (All versions < V4.3.8), RUGGEDCOM RSG920P V5.X (All versions < V5.7.0), RUGGEDCOM RSL910 (All versions < V5.7.0), RUGGEDCOM RST2228 (All versions < V5.7.0), RUGGEDCOM RST2228P (All versions < V5.7.0), RUGGEDCOM RST916C (All versions < V5.7.0), RUGGEDCOM RST916P (All versions < V5.7.0). The SSH server on affected devices is configured to offer weak ciphers by default. This could allow an unauthorized attacker in a man-in-the-middle position to read and modify any data passed over the connection between legitimate clients and the affected device. Weakness: CWE-311 (Missing Encryption of Sensitive Data), CWE-326 (Inadequate Encryption Strength) ## Which versions are affected by CVE-2021-37209? It affects 1 product. Products: Siemens Ruggedcom Ros. ## How do I fix CVE-2021-37209? No fix has been published for CVE-2021-37209 yet. Limit exposure of the affected software until one is available. ## Is CVE-2021-37209 being exploited? There is no known exploitation of CVE-2021-37209 in the wild and no public exploit code. ## Other vulnerabilities in Siemens RUGGEDCOM M2100 - [CVE-2021-37208](https://insights.sbomify.com/CVE-2021-37208/): Cross-site scripting in RUGGEDCOM M2100 (critical 9.6) - [CVE-2023-24845](https://insights.sbomify.com/CVE-2023-24845/): Other in RUGGEDCOM M2100 (critical 9.1) - [CVE-2017-12736](https://insights.sbomify.com/CVE-2017-12736/): Missing authorization in RUGGEDCOM M2100 (high 8.8) - [CVE-2022-34663](https://insights.sbomify.com/CVE-2022-34663/): Code injection in RUGGEDCOM M2100 (high 8.0) - [CVE-2023-39269](https://insights.sbomify.com/CVE-2023-39269/): Denial of service in RUGGEDCOM M2100 (high 7.5) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-37209 and fix it if it is affected. What it is: CVE-2021-37209 is a medium-severity vulnerability in Siemens RUGGEDCOM M2100, published on 8 Mar 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2021-37209 in the wild and no public exploit code. Affected product: Siemens RUGGEDCOM M2100. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2021-37209/ (Markdown: https://insights.sbomify.com/CVE-2021-37209/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37209 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37209 - OSV: https://osv.dev/vulnerability/CVE-2021-37209 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-37209/ Summaries are generated and may contain mistakes; the official description above is the record.