Buffer overflow in Proxychains-Ng Project
CVE-2025-34451
rofl0r/proxychains-ng versions up to and including 4.17 and prior to commit cc005b7 contain a stack-based buffer overflow vulnerability in the function proxy_from_string() located in src/libproxychains.c. When parsing crafted proxy configuration entries containing overly long username or password fields, the application may write beyond the bounds of fixed-size stack buffers, leading to memory corruption or crashes. This vulnerability may allow denial of service and, under certain conditions, could be leveraged for further exploitation depending on the execution environment and applied mitigations.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (16.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Proxychains-Ng Project
- Rofl0r Proxychains-Ng — versions 0, cc005b7132811c9149e77b5e33cff359fc95512e
Weakness classification (CWE)
References
- github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-008-proxych… (Exploit, technical-description, Third Party Advisory, exploit)
- github.com/rofl0r/proxychains-ng/issues/606 (issue-tracking, Exploit, Patch)
- github.com/httpsgithu/proxychains-ng/commit/cc005b7 (Patch, patch)
- www.vulncheck.com/advisories/rofl0r-proxychains-ng-stack-based-buffer-overflow (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34451?
- CVE-2025-34451 is a high-severity vulnerability in Proxychains-Ng Project, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2025-12-18.
- How severe is CVE-2025-34451?
- High severity. CVSS v3 base score is 7.8 out of 10.