CVE-2021-29432mediumCWE-20

CVE-2021-29432: medium-severity vulnerability in matrix-org sydent

Malicious users could control the content of invitation emails

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 0.9%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
matrix-org · sydent
Related CVEs — matrix-org sydent

In the same product, most dangerous first.

CVE-2021-29430HIGHDenial of service attack via memory exhaustionEPSS 1.8%CVE-2021-29431HIGHSSRF in Sydent due to missing validation of hostnamesEPSS 1.2%CVE-2021-29433MEDIUMDenial of service (via resource exhaustion) due to improper input validationEPSS 0.9%CVE-2023-38686CRITICALSydent does not verify email server certificatesEPSS 0.3%