MEDIUM
CVE-2021-29432
CWE-20Published: April 15, 2021· Updated: Jun 17, 2026
5.7
CVSS v3.1
Official Description
Sydent is a reference matrix identity server. A malicious user could abuse Sydent to send out arbitrary emails from the Sydent email address. This could be used to construct plausible phishing emails, for example. This issue has been fixed in 4469d1d.
Technical Analysis
CVE-2021-29432 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.7.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Affected Vendors & Products
matrix1 product(s)
sydent
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
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (8)
→
https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42Patch · Third Party Advisory
→
https://github.com/matrix-org/sydent/releases/tag/v2.3.0Release Notes · Third Party Advisory
→
https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjxPatch · Third Party Advisory
→
https://pypi.org/project/matrix-sydent/Product · Third Party Advisory
→
https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42Patch · Third Party Advisory
→
https://github.com/matrix-org/sydent/releases/tag/v2.3.0Release Notes · Third Party Advisory
→
https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjxPatch · Third Party Advisory
→
https://pypi.org/project/matrix-sydent/Product · Third Party Advisory
Quick Facts
CVE IDCVE-2021-29432
CVSS Score5.7 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedApr 15, 2021
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-29432 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.