# CVE-2025-20352: Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution > Authenticated attackers can cause denial of service or execute arbitrary code as root via crafted SNMP packets due to a stack overflow. - **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`) - **Exploited in the wild:** Yes, since 29 Sep 2025 (CISA KEV) - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 24 Sep 2025 - **Updated:** 26 Feb 2026 - **Also known as:** GHSA-c924-mch4-p3p3 ## What is CVE-2025-20352? CVE-2025-20352 is a high-severity memory corruption vulnerability in Cisco Ios, published on 24 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisco IOS XE Software. To execute code as the root user, the attacker must have the SNMPv1 or v2c read-only community string or valid SNMPv3 user credentials and administrative or privilege 15 credentials on the affected device. An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device over IPv4 or IPv6 networks. This vulnerability is due to a stack overflow condition in the SNMP subsystem of the affected software. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system. Note: This vulnerability affects all versions of SNMP. Weakness: CWE-121 (Stack-based Buffer Overflow) ## Which versions are affected by CVE-2025-20352? It affects 3 products. Products: Cisco Ios, Cisco Ios Xe, Cisco Ios Xe Sd-Wan. ## How do I fix CVE-2025-20352? No fix has been published for CVE-2025-20352 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 20 Oct 2025. ## Is CVE-2025-20352 being exploited? Yes. Attackers have exploited CVE-2025-20352 in the wild since at least 29 Sep 2025. Public exploit code: - CVE-2025-20352 SNMP Exposure Check (onesixtyone + parser) (github_poc): https://github.com/scadastrangelove/CVE-2025-20352 - CVE-2025-20352 Research writeup (github_poc): https://github.com/sentinel-aidefense/CVE-2025-20352 ## Other vulnerabilities in Cisco Ios - [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild) - [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild) - [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2025-20352 and fix it if it is affected. What it is: CVE-2025-20352 is a high-severity memory corruption vulnerability in Cisco Ios, published on 24 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: Yes. Attackers have exploited CVE-2025-20352 in the wild since at least 29 Sep 2025. Affected product: Cisco Ios. 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-2025-20352/ (Markdown: https://insights.sbomify.com/CVE-2025-20352/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20352 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20352 - OSV: https://osv.dev/vulnerability/CVE-2025-20352 --- From sbomify Insights: https://insights.sbomify.com/CVE-2025-20352/ Summaries are generated and may contain mistakes; the official description above is the record.