Vulnerability · Published Jul 11, 2025 · Assigned by facebook
CVE-2025-30403
High 8.1
In plain English
A high-severity security flaw in mvfst from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.3%top 73.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A heap-buffer-overflow vulnerability is possible in mvfst via a specially crafted message during a QUIC session. This issue affects mvfst versions prior to v2025.07.07.00.
Affected products (as reported)
References
- https://www.facebook.com/security/advisories/cve-2025-30403 x_refsource_CONFIRM
- https://github.com/facebook/mvfst/commit/65b297332191de6e867c4a3139a233fc84c0e7e0 x_refsource_CONFIRM