CVE-2025-34451

MEDIUM EPSS 12.2%
Published Dec 18, 20256mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Dec 18, 2025 6mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
12.2% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-121
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 1

VendorProductVersionRange
proxychains-ng_projectproxychains-ng* ≤4.17

References 4

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

Remediation

  • github.com https://github.com/httpsgithu/proxychains-ng/commit/cc005b7
    Patch
  • github.com https://github.com/rofl0r/proxychains-ng/issues/606
    ExploitPatch