CVE-2025-34451: rofl0r/proxychains-ng versions up to and including 4.17 and prior to commit cc005b7 contain a stack-based buff

Q: How do I fix CVE-2025-34451?

proxychains-ng: upgrade to newer than 4.17. Exact commands for each OS are on this page.

Q: Is CVE-2025-34451 being exploited?

CVE-2025-34451 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-34451 affect?

CVE-2025-34451 affects proxychains-ng. Severity is high (CVSS 7.8). 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 configur

Q: How urgent is CVE-2025-34451?

Priority 37/100. High severity; Public exploit reference

Routine

HIGH 7.8UPGRADE

CVE-2025-34451 is a high-severity flaw (CVSS 7.8) affecting proxychains-ng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 d

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2025-12-18
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: proxychains-ng project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-18 22:15 UTCPublished CVE record published
2026-06-17 09:14 UTCUpdated Record last modified

proxychains-ng project proxychains-ng UPGRADE

Affected: <= 4.17

Fixed in: newer than 4.17

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy proxychains-ng || rpm -q proxychains-ng || proxychains-ng --version

2. UPGRADE to newer than 4.17 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade proxychains-ng

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade proxychains-ng

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-34451?

proxychains-ng: upgrade to newer than 4.17. Exact commands for each OS are on this page.

Is CVE-2025-34451 being exploited?

CVE-2025-34451 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-34451 affect?

CVE-2025-34451 affects proxychains-ng. Severity is high (CVSS 7.8). 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 configur

How urgent is CVE-2025-34451?

Priority 37/100. High severity; Public exploit reference

References

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