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

Quick assessment

Affected
rofl0r proxychains-ng
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

proxychains-ng是rofl0r个人开发者的一个预加载程序。 proxychains-ng 4.17及之前版本和cc005b7之前版本存在安全漏洞，该漏洞源于proxy_from_string函数存在栈缓冲区溢出，可能导致内存损坏或崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
rofl0r proxychains-ng ≤ 4.17 affected
cc005b7132811c9149e77b5e33cff359fc95512e unaffected
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I. Basic Information for CVE-2025-34451

Vulnerability Information
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Vulnerability Title
rofl0r/proxychains-ng <= 4.17 Stack-based Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
proxychains-ng 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
proxychains-ng是rofl0r个人开发者的一个预加载程序。 proxychains-ng 4.17及之前版本和cc005b7之前版本存在安全漏洞，该漏洞源于proxy_from_string函数存在栈缓冲区溢出，可能导致内存损坏或崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rofl0r proxychains-ng 0 ~ 4.17 -

II. Public POCs for CVE-2025-34451

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III. Intelligence Information for CVE-2025-34451

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Patches & Fixes for CVE-2025-34451 (1)

Other References for CVE-2025-34451 (3)

IV. Related Vulnerabilities

Same vendor: rofl0r
Same weakness: CWE-121

V. Comments for CVE-2025-34451

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