CVE-2025-30403high

CVE-2025-30403: high-severity vulnerability in Facebook mvfst

Published

Follow this CVE+ Monitor mvfst

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.1epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Affected products
Facebook · mvfst
Related CVEs — Facebook mvfst

In the same product, most dangerous first.

CVE-2021-24029—CVE-2021-24029EPSS 1.2%