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CVE-2021-29432

20
FAUCET Score

CVE-2021-29432 describes a medium-severity vulnerability in Sydent, the reference Matrix identity server, allowing a malicious user to send arbitrary emails from the Sydent email address. This could facilitate plausible phishing attacks. The vulnerability has a CVSS score of 5.7 (medium) due to its network attack vector, low attack complexity, and high impact on integrity, though it requires user interaction. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage regarding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.3.0CPE matchmatch criteria
cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.93%
Probability of exploitation in next 30 days
EPSS Percentile
57.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0093 is in the 91st percentile among its peer group of 15,225 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 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
pippatch availablevia ghsa
Product: matrix-sydentFixed in: 2.3.0

Vendor Advisories (1)

pipGHSA-mh74-4m5g-fcjxmedium

Malicious users could abuse Sydent to control the content of invitation emails

Apr 19, 2021

References

github.com / matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42
PatchThird Party Advisory
github.com / matrix-org/sydent/releases/tag/v2.3.0
Release NotesThird Party Advisory
github.com / matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx
PatchThird Party Advisory
pypi.org / project/matrix-sydent
ProductThird Party Advisory