What’s Vulnerable › Vulnerabilities

CVE-2025-34451: rofl0r/proxychains-ng <= 4.17 Stack-based Buffer Overflow

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-18 · updated 2026-06-17
• Weakness: CWE-121

Description

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.

Affected products

• rofl0r proxychains-ng: through 4.17

References

• https://github.com/httpsgithu/proxychains-ng/commit/cc005b7
• https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-008-proxychains-ng-stack-buffer-overflow-proxy_from_string.md
• https://github.com/rofl0r/proxychains-ng/issues/606
• https://www.vulncheck.com/advisories/rofl0r-proxychains-ng-stack-based-buffer-overflow
• https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-008-proxychains-ng-stack-buffer-overflow-proxy_from_string.md

Get alerted when CVE-2025-34451 or the next vulnerability affects your stack