Vulnerability Details : CVE-2021-29433
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.
Vulnerability category: Input validation
Products affected by CVE-2021-29433
- cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-29433
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 34 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-29433
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | AV:N/AC:L/Au:S/C:N/I:N/A:P |
8.0
|
2.9
|
NIST | |
|
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
2.8
|
1.4
|
NIST | |
|
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
2.8
|
1.4
|
GitHub, Inc. |
CWE ids for CVE-2021-29433
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: security-advisories@github.com (Primary)
-
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.Assigned by: nvd@nist.gov (Secondary)
References for CVE-2021-29433
-
https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da
Validation improvements · matrix-org/sydent@3175fd3 · GitHubPatch;Third Party Advisory
-
https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553
Denial of service (via resource exhaustion) due to improper input validation · Advisory · matrix-org/sydent · GitHubPatch;Third Party Advisory
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