CVE-2024-52805

Name: CVE-2024-52805
Creator: NVD / NIST
Published: 2024-12-03T17:15:12.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2024-52805 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

8.2/10

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.70%

48.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Matrix	Synapse	< 1.120.1

References

https://github.com/element-hq/synapse/security/advisories/GHSA-rfq8-j7rh-8hf2Vendor Advisory
https://github.com/twisted/twisted/issues/4688#issuecomment-1167705518Issue Tracking
https://github.com/twisted/twisted/issues/4688#issuecomment-2385711609Issue Tracking

Timeline

Published: Dec 3, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-52805?

How severe is CVE-2024-52805?

CVE-2024-52805 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2024-52805?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-52805?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST