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CVE-2021-29433

MEDIUM
Published 2021-04-15T17:55:11
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Expert Analysis

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CVSS Score

V3.1
4.3
/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.003
probability
of exploitation in the wild

There is a 0.3% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.510
Higher than 51.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
LOW

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

matrix-org

sydent

Affected Versions:

<= 2.2.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Sydent DoS (via resource exhaustion) due to improper input validation

GHSA-pw4v-gr34-2553

Advisory Details

### 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

PyPI matrix-sydent
ECOSYSTEM: ≥0 <2.3.0

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

WEB https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-29433
WEB https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da
PACKAGE https://github.com/matrix-org/sydent
WEB https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-24.yaml
WEB https://pypi.org/project/matrix-sydent

Advisory provided by GitHub Security Advisory Database. Published: April 16, 2021, Modified: September 24, 2024

References

https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553
https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da
Published: 2021-04-15T17:55:11
Last Modified: 2024-08-03T22:02:51.915Z
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