4.3

CVE-2021-29433: matrix-org sydent Improper Input Validation

CVSS: 4.3v3.1MediumModified
AliasesGHSA-pw4v-gr34-2553PYSEC-2021-24
Published 15-04-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-29433 is a medium (CVSS 4.3) Improper Input Validation vulnerability in matrix-org sydent. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 59.8% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.93%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 3 sources · 3 versions

EPSS trend

Probability

0.93%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

0.00 pp

From 0.93% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.93%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Matrix1 product
Matrix-org1 product
PyPI1 product
  • matrix-sydent< 2.3.0

3 vendors · 3 products

References

7 links