CVE-2025-23197Network attack vector

Restart crash via unchecked GitHub installations

Published Jan 27, 2025 · Updated Feb 12, 2025

Denial of service in Matrix Hookshot before 5.4.2 and 6.0.0 through 6.0.1 allows remote authenticated users to cause a crash on restart. GithubInstance processes every returned GitHub App installation through addInstallation without skipping suspended entries or containing thrown exceptions, so one failed installation aborts startup. GitHub support must be enabled, and users with manageConnections permission can increase exposure by adding organizations; the bounded consequence is interruption of the Hookshot service after a restart.

CVSS severity6.5
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Matrix Hookshot before 5.4.2 and 6.0.0 through 6.0.1 allows remote authenticated users to cause a crash on restart. GithubInstance processes every returned GitHub App installation through addInstallation without skipping suspended entries or containing thrown exceptions, so one failed installation aborts startup. GitHub support must be enabled, and users with manageConnections permission can increase exposure by adding organizations; the bounded consequence is interruption of the Hookshot service after a restart.

The record

CVE
CVE-2025-23197
Published
Jan 27, 2025
Updated
Feb 12, 2025
Vendor
Matrix.org
Product
Matrix Hookshot
Classifications
CWE-754, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.4.2
  2. Affected versionversion=>= 6.0.0, < 6.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Matrix.org · Matrix Hookshotversion=< 5.4.2; version=>= 6.0.0, < 6.0.2

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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