CVE-2025-34451

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory published 2025-12-19. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

December 18, 2025

Last Modified

December 31, 2025

Advisory Details (4)

Auto-updated Aug 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

advisories/advisories/MCSAID-2025-008-proxychains-ng-stack-buffer-overflow-proxy_from_string.md at main · marlinkcyber/advisories · GitHub

https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-008-proxychains-ng-stack-buffer-overflow-proxy_from_string.md
generic

rofl0r/proxychains-ng <= 4.17 Stack-based Buffer Overflow | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rofl0r-proxychains-ng-stack-based-buffer-overflow
generic

Stack Buffer Overflow in proxy_from_string() in libproxychains.c:254 · Issue #606 · rofl0r/proxychains-ng · GitHub

https://github.com/rofl0r/proxychains-ng/issues/606
github_commit

commit cc005b7 (httpsgithu/proxychains-ng)

Fix landed in httpsgithu/proxychains-ng commit cc005b7 — awaiting tagged release

https://github.com/httpsgithu/proxychains-ng/commit/cc005b7

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
proxychains-ng4.14-3 ... 4.17-3.1 (10 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
proxychains-ng4.16-2 ... 4.17-4 (8 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
proxychains-ng4.17-3, 4.17-3.1, 4.17-4——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
proxychains-ng4.17-34.17-3.1—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 148 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
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  1. 2026-08-21 23:48 UTCEPSS rescore
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  17. 2026-08-08 05:53 UTCGHSA enrichment
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-34451?
CVE-2025-34451 is a high vulnerability published on December 18, 2025. 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 proxyfromstring() located in src/libproxychains.c. When parsing crafted proxy configuration entries containing overly long username or password…
When was CVE-2025-34451 disclosed?
CVE-2025-34451 was first published in the National Vulnerability Database on December 18, 2025, with the most recent update on December 31, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-34451 actively exploited?
CVE-2025-34451 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.2% of all scored CVEs.
What is the CVSS score of CVE-2025-34451?
CVE-2025-34451 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2025-34451?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-34451, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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