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CVE-2022-39200

20
FAUCET Score

CVE-2022-39200 affects Dendrite, a Matrix homeserver, where versions prior to 0.9.8 failed to properly verify signatures for events retrieved from remote homeservers via the /get_missing_events path, potentially allowing the injection of invalid or modified events. This vulnerability has a CVSS score of 5.3 (Medium), indicating a network-based attack with low complexity and a potential impact of low integrity, but no confidentiality or availability impact. There is no known active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.8CPE matchmatch criteria
cpe:2.3:a:matrix:dendrite:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.31%
Probability of exploitation in next 30 days
EPSS Percentile
22.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0031 is in the 13th percentile among its peer group of 23,703 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/matrix-org/dendriteFixed in: 0.9.8

Vendor Advisories (1)

goGHSA-pfw4-xjgm-267chigh

Dendrite signature checks not applied to some retrieved missing events

Sep 15, 2022

References

github.com / matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3
PatchThird Party Advisory
github.com / matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c
Third Party Advisory