HOMEVULNERABILITIESCVE-2025-66622
HIGH

CVE-2025-66622

CWE-755Published: December 9, 2025· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.

NVD Source

Technical Analysis

CVE-2025-66622 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

matrix1 product(s)
matrix-rust-sdk
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0
PATCHhttps://github.com/matrix-org/matrix-rust-sdk/pull/5924
PATCHhttps://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3
ADVISORYhttps://rustsec.org/advisories/RUSTSEC-2025-0135.html

All References (4)

→
https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0Patch
→
https://github.com/matrix-org/matrix-rust-sdk/pull/5924Issue Tracking · Patch
→
https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3Patch · Vendor Advisory
→
https://rustsec.org/advisories/RUSTSEC-2025-0135.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2025-66622
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-755
CISA KEVNo
Affected1 vendor(s)
PublishedDec 9, 2025

Related CVEs (CWE-755)

CVE-2022-23121
9.8
CVE-2021-4105
9.8
CVE-2023-25561
9.8
CVE-2022-48328
9.8
CVE-2022-48329
9.8
CVE-2023-28631
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2025-66622 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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