Medium severity · published Apr 15, 2021
CVE-2021-29433
Sydent is a reference Matrix identity server
4.3
CVSS
0.9%
EPSS
No
On KEV
Description
Sydent is a reference Matrix identity server. In Sydent versions 2.2.0 and prior, sissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. A patch for the vulnerability is in version 2.3.0. No workarounds are known to exist.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SY
Sydent · Matrix
before 2.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29433
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-29433
Patch
https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da
Patch
https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553
More from Sydent
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CVE-2021-29430
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An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1
6.5
CVE-2021-29431
Sydent is a reference Matrix identity server
5.9
CVE-2019-11340
util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions that are based on e-mail domain, if the allowed_local_3pids option is enabled
5.7
CVE-2021-29432
Sydent is a reference matrix identity server