8.2

CVE-2024-52805: element-hq synapse

CVSS: 8.2v4.0HighAnalyzed
AliasesGHSA-rfq8-j7rh-8hf2PYSEC-2026-1613UBUNTU-CVE-2024-52805
Published 03-12-2024Last modified 03-12-2024
Open JSON

Vulnerability summary

CVE-2024-52805 is a high (CVSS 8.2) vulnerability in element-hq synapse. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 53.7% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.74%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2024:14541-1

Timeline

  1. 03-12-2024
    PublishedVulnerability first disclosed.
  2. 03-12-2024
    Last modifiedVulnerability information updated.

Description

Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. Synapse 1.120.1 resolves the issue by denying requests with unsupported multipart/form-data content type.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.74%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

0.00 pp

From 0.74% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.74%

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

Debian1 product
  • matrix-synapse< 1.121.0-1
Element-hq1 product
Matrix1 product
PyPI1 product
  • matrix-synapse< 1.120.1
Ubuntu1 product
  • matrix-synapseAll versions (No fix recorded)

5 vendors · 5 products

References

10 links