CVE-2021-29433
MEDIUM4.3EPSS 0.28%Sydent DoS (via resource exhaustion) due to improper input validation
Published: 4/16/2021Modified: 3/13/2026
Description
### Impact Missing 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. ### Patches Fixed by 3175fd3. ### For more information If you have any questions or comments about this advisory, email us at [email protected].
Affected packages (2)
- PyPI/matrix-sydentfrom 0, < 2.3.0
- PyPI/matrix-sydentfrom 0, < 2.3.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-29433
- PATCHhttps://github.com/matrix-org/sydent
- PATCHhttps://pypi.org/project/matrix-sydent/
- WEBhttps://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da
- WEBhttps://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-24.yaml
- WEBhttps://pypi.org/project/matrix-sydent