# CVE-2025-52961: Denial of service in Junos OS Evolved > An unauthenticated adjacent attacker can cause a memory leak and FPC crash in Juniper PTX routers by sending specific valid traffic, resulting in denial of service. - **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Green`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 9 Oct 2025 - **Updated:** 9 Oct 2025 - **Also known as:** GHSA-6rrp-5qvj-5rj8 ## What is CVE-2025-52961? CVE-2025-52961 is a high-severity denial of service vulnerability in Juniper Junos Os Evolved, published on 9 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description An Uncontrolled Resource Consumption vulnerability in the Connectivity Fault Management (CFM) daemon and the Connectivity Fault Management Manager (cfmman) of Juniper Networks Junos OS Evolved on PTX10001-36MR, PTX10002-36QDD, PTX10004, PTX10008, PTX10016 allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). An attacker on an adjacent device sending specific valid traffic can cause cfmd to spike the CPU to 100% and cfmman's memory to leak, eventually to cause the FPC crash and restart. Continued receipt and processes of these specific valid packets will sustain the Denial of Service (DoS) condition. An indicator of compromise is to watch for an increase in cfmman memory rising over time by issuing the following command and evaluating the RSS number. If the RSS is growing into GBs then consider restarting the device to temporarily clear memory.   user@device> show system processes node fpc detail | match cfmman Example:    show system processes node fpc0 detail | match cfmman    F S UID       PID       PPID PGID   SID   C PRI NI  ADDR SZ    WCHAN   RSS     PSR STIME TTY         TIME     CMD   4 S root      15204     1    15204  15204 0 80  0   - 90802     -      113652   4  Sep25 ?           00:15:28 /usr/bin/cfmman -p /var/pfe -o -c /usr/conf/cfmman-cfg-active.xml This issue affects Junos OS Evolved on PTX10001-36MR, PTX10002-36QDD, PTX10004, PTX10008, PTX10016: * from 23.2R1-EVO before 23.2R2-S4-EVO, * from 23.4 before 23.4R2-S4-EVO, * from 24.2 before 24.2R2-EVO, * from 24.4 before 24.4R1-S2-EVO, 24.4R2-EVO. This issue does not affect Junos OS Evolved on PTX10001-36MR, PTX10002-36QDD, PTX10004, PTX10008, PTX10016 before 23.2R1-EVO. Weakness: CWE-400 (Uncontrolled Resource Consumption) ## Which versions are affected by CVE-2025-52961? It affects 1 product. Products: Juniper Junos Os Evolved. ## How do I fix CVE-2025-52961? No fix has been published for CVE-2025-52961 yet. Limit exposure of the affected software until one is available. ## Is CVE-2025-52961 being exploited? There is no known exploitation of CVE-2025-52961 in the wild and no public exploit code. ## Other vulnerabilities in Juniper Junos Os Evolved - [CVE-2026-21902](https://insights.sbomify.com/CVE-2026-21902/): Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root (critical 9.3) - [CVE-2023-28983](https://insights.sbomify.com/CVE-2023-28983/): Junos OS Evolved: Shell Injection vulnerability in the gNOI server (high 8.8) - [CVE-2025-21599](https://insights.sbomify.com/CVE-2025-21599/): Denial of service in Junos OS Evolved (high 8.7) - [CVE-2024-47502](https://insights.sbomify.com/CVE-2024-47502/): Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS (high 8.7) - [CVE-2024-39531](https://insights.sbomify.com/CVE-2024-39531/): Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols (high 8.7) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2025-52961 and fix it if it is affected. What it is: CVE-2025-52961 is a high-severity denial of service vulnerability in Juniper Junos Os Evolved, published on 9 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2025-52961 in the wild and no public exploit code. Affected product: Juniper Junos Os Evolved. 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-2025-52961/ (Markdown: https://insights.sbomify.com/CVE-2025-52961/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2025-52961 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-52961 - OSV: https://osv.dev/vulnerability/CVE-2025-52961 --- From sbomify Insights: https://insights.sbomify.com/CVE-2025-52961/ Summaries are generated and may contain mistakes; the official description above is the record.