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.

Classification

CVE ID: CVE-2024-52805

CVSS Base Severity: HIGH

CVSS Base Score: 8.2

Affected Products

Vendor: element-hq

Product: synapse

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.81% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://github.com/element-hq/synapse/security/advisories/GHSA-rfq8-j7rh-8hf2
https://github.com/twisted/twisted/issues/4688#issuecomment-1167705518
https://github.com/twisted/twisted/issues/4688#issuecomment-2385711609

Timeline