CVE-2022-46505: An issue in MatrixSSL 4.5.1-open and earlier leads to failure to securely check the SessionID field, resulting

Q: How do I fix CVE-2022-46505?

matrixssl: upgrade to newer than 4.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2022-46505 being exploited?

CVE-2022-46505 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-2022-46505 affect?

CVE-2022-46505 affects matrixssl. Severity is high (CVSS 7.5). An issue in MatrixSSL 4.5.1-open and earlier leads to failure to securely check the SessionID field, resulting in the misuse of an all-zero MasterSecret that can decrypt secret data.

Q: How urgent is CVE-2022-46505?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2022-46505 is a high-severity flaw (CVSS 7.5) affecting matrixssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in MatrixSSL 4.5.1-open and earlier leads to failure to securely check the SessionID field, resulting in the misuse of an all-zero MasterSecret that can decrypt secret data.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-665
Published	2023-01-18
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

2023-01-18 16:15 UTCPublished CVE record published
2026-06-17 05:11 UTCUpdated Record last modified

matrixssl matrixssl UPGRADE

Affected: <= 4.5.1

Fixed in: newer than 4.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.5.1 (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.

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-2022-46505?

matrixssl: upgrade to newer than 4.5.1. Exact commands for each OS are on this page.

Is CVE-2022-46505 being exploited?

CVE-2022-46505 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-2022-46505 affect?

CVE-2022-46505 affects matrixssl. Severity is high (CVSS 7.5). An issue in MatrixSSL 4.5.1-open and earlier leads to failure to securely check the SessionID field, resulting in the misuse of an all-zero MasterSecret that can decrypt secret data.

How urgent is CVE-2022-46505?

Priority 51/100. High severity; Public exploit reference; 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-2022-43974 HIGH 8.1 UPGRADE MatrixSSL 4.0.4 through 4.5.1 has an integer overflow in matrixSslDecodeTls13

References

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