CVE-2022-46505Public exploitNetwork attack vector

TLS session decryption via truncated SessionID validation

Published Jan 18, 2023 · Updated Apr 4, 2025

Improper initialization in MatrixSSL 4.5.1-open and earlier allows remote attackers to decrypt TLS session data through session resumption. The matrixResumeSession function accepts a one-byte SessionID as a quick index, treats the missing bytes as zeros, and selects a session-table entry whose MasterSecret remains all zeros. No authentication or user interaction is required, and the demonstrated consequence is disclosure of TLS-protected data without integrity or availability impact.

CVSS severity7.5
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper initialization in MatrixSSL 4.5.1-open and earlier allows remote attackers to decrypt TLS session data through session resumption. The matrixResumeSession function accepts a one-byte SessionID as a quick index, treats the missing bytes as zeros, and selects a session-table entry whose MasterSecret remains all zeros. No authentication or user interaction is required, and the demonstrated consequence is disclosure of TLS-protected data without integrity or availability impact.

The record

CVE
CVE-2022-46505
Published
Jan 18, 2023
Updated
Apr 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-665
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-665Improper Initialization

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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