CVE-2022-43974: MatrixSSL 4.0.4 through 4.5.1 has an integer overflow in matrixSslDecodeTls13

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HIGH 8.1REMOTEUPGRADE

CVE-2022-43974 is a high-severity flaw (CVSS 8.1) affecting matrixssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MatrixSSL 4.0.4 through 4.5.1 has an integer overflow in matrixSslDecodeTls13. A remote attacker might be able to send a crafted TLS Message to cause a buffer overflow and achieve remote code execution. This is fixed in 4.6.0.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-190
Published	2023-01-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: matrixssl

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

Am I affected?

Timeline

2023-01-09 09:15 UTCPublished CVE record published
2026-06-17 05:07 UTCUpdated Record last modified

matrixssl matrixssl UPGRADE

Affected: >= 4.0.0 and < 4.6.0

Fixed in: 4.6.0

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 4.6.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade matrixssl

Note

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

3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison matrixssl sudo apt install matrixssl=<VERSION_BEFORE_4.0.0> sudo apt-mark hold matrixssl

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list matrixssl sudo dnf downgrade matrixssl-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add matrixssl

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-43974?

matrixssl: upgrade to 4.6.0. Exact commands for each OS are on this page.

Is CVE-2022-43974 being exploited?

CVE-2022-43974 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-2022-43974 affect?

CVE-2022-43974 affects matrixssl. Severity is high (CVSS 8.1). MatrixSSL 4.0.4 through 4.5.1 has an integer overflow in matrixSslDecodeTls13. A remote attacker might be able to send a crafted TLS Message to cause a buffer overflow and achieve remote code execution. This is fixed in 4.6.0.

How urgent is CVE-2022-43974?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-24609 HIGH 7.5 UPGRADE MITIGATE Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hell
CVE-2022-46505 HIGH 7.5 UPGRADE An issue in MatrixSSL 4.5.1-open and earlier leads to failure to securely check the SessionID field, resulting

References

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