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CVE-2022-39200

HIGH
Published 2022-09-12T20:10:09.000Z
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CVSS Score

V3.1
7.3
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.000
probability
of exploitation in the wild

There is a 0.0% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.063
Higher than 6.3% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
LOW
Availability
LOW

Description

Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

matrix-org

dendrite

Affected Versions:

< 0.9.8

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed HIGH

Dendrite signature checks not applied to some retrieved missing events

GHSA-pfw4-xjgm-267c

Advisory Details

### Impact Events retrieved from a remote homeserver using `/get_missing_events` did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. ### Patches The problem has been fixed in Dendrite 0.9.8. ### Workarounds There are no workarounds. ### Special thanks Tulir Asokan, who spotted the issue originally.

Affected Packages

Go github.com/matrix-org/dendrite
ECOSYSTEM: ≥0 <0.9.8

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

WEB https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2022-39200
WEB https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3
PACKAGE https://github.com/matrix-org/dendrite

Advisory provided by GitHub Security Advisory Database. Published: September 15, 2022, Modified: September 15, 2022

References

https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c
https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3
Published: 2022-09-12T20:10:09.000Z
Last Modified: 2025-04-23T17:12:01.868Z
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