CVE-2023-4807: Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt

Q: How do I fix CVE-2023-4807?

openssl: upgrade to 1.1.1w, 3.0.11, 3.1.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-4807 being exploited?

CVE-2023-4807 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-2023-4807 affect?

CVE-2023-4807 affects openssl. Severity is high (CVSS 7.8). Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt the internal state of applications on the Windows 64 platform when running on newer X86_64 processors supporting the AVX512-IFMA

Q: How urgent is CVE-2023-4807?

Priority 51/100. High severity; On your watchlist

This month

HIGH 7.8WATCHLISTUPGRADE

CVE-2023-4807 is a high-severity flaw (CVSS 7.8) 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 on the Windows 64 platform when running on newer X86_64 processors supporting the AVX512-IFMA instructions. Impact summary: If in an application that uses the OpenSSL library an attacker can influence whether the POLY1305 MAC algorithm is used, the application state might be corrupted with various appl

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-440
Published	2023-09-08
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

2023-09-08 12:15 UTCPublished CVE record published
2026-10-14 22:17 UTCUpdated Record last modified

openssl openssl UPGRADE

Affected: >= 1.1.1 and < 1.1.1w · >= 3.0.0 and < 3.0.11 · >= 3.1.0 and < 3.1.3

Fixed in: 1.1.1w, 3.0.11, 3.1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.1.1w (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-2023-4807?

openssl: upgrade to 1.1.1w, 3.0.11, 3.1.3. Exact commands for each OS are on this page.

Is CVE-2023-4807 being exploited?

CVE-2023-4807 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-2023-4807 affect?

CVE-2023-4807 affects openssl. Severity is high (CVSS 7.8). Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt the internal state of applications on the Windows 64 platform when running on newer X86_64 processors supporting the AVX512-IFMA

How urgent is CVE-2023-4807?

Priority 51/100. High severity; On your watchlist

Software pages

OpenSSL vulnerabilities · Windows vulnerabilities

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CVE-2023-6129 MEDIUM 6.5 UPGRADE Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt
CVE-2023-5678 MEDIUM 5.3 UPGRADE Issue summary: Generating excessively long X9.42 DH keys or checking excessively long X9.42 DH keys or paramet
CVE-2023-3817 MEDIUM 5.3 UPGRADE Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications

References

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