CVE-2023-6129: Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt

Q: How do I fix CVE-2023-6129?

openssl: upgrade to newer than 3.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2023-6129 being exploited?

CVE-2023-6129 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-2023-6129 affect?

CVE-2023-6129 affects openssl. Severity is medium (CVSS 6.5). Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt the internal state of applications running on PowerPC CPU based platforms if the CPU provides vector instructions. Impact summar

Q: How urgent is CVE-2023-6129?

Priority 54/100. Remotely exploitable, no login, no user action; On your watchlist

This month

MEDIUM 6.5REMOTEWATCHLISTUPGRADE

CVE-2023-6129 is a medium-severity flaw (CVSS 6.5) affecting openssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt the internal state of applications running on PowerPC CPU based platforms if the CPU provides vector instructions. Impact summary: If an attacker can influence whether the POLY1305 MAC algorithm is used, the application state might be corrupted with various application dependent consequences. The POLY1305 MAC (message authentication co

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-440, CWE-787
Published	2024-01-09
Last modified	2026-10-14

Publisher (CNA): OpenSSL Software Foundation · Vendor: openssl

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-09 17:15 UTCPublished CVE record published
2026-10-14 23:17 UTCUpdated Record last modified

openssl openssl UPGRADE

Affected: >= 3.0.0 and <= 3.0.12 · >= 3.1.0 and <= 3.1.4 · 3.2.0

Fixed in: newer than 3.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openssl || rpm -q openssl || openssl --version

2. UPGRADE to newer than 3.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openssl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openssl

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-2023-6129?

openssl: upgrade to newer than 3.1.4. Exact commands for each OS are on this page.

Is CVE-2023-6129 being exploited?

CVE-2023-6129 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-2023-6129 affect?

CVE-2023-6129 affects openssl. Severity is medium (CVSS 6.5). Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt the internal state of applications running on PowerPC CPU based platforms if the CPU provides vector instructions. Impact summar

How urgent is CVE-2023-6129?

Priority 54/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

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References

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