CVE-2021-24029

HIGH 7.5CVE-2021-24029 · Published 15/03/2021 · updated 17/06/2026

In short

CVE-2021-24029 is a HIGH (CVSS 7.5) vulnerability affecting mvfst (facebook), proxygen (facebook).
Chance of exploitation in the next 30 days (EPSS): 1.2%, higher than 67.9% of all vulnerabilities.
Fix: update to 2021-03-13, 2021.03.15.00 or later.

Package	Affected versions	Patched versions
mvfst facebook	`< 2021-03-13`	`2021-03-13`
proxygen facebook	`< 2021.03.15.00`	`2021.03.15.00`

Description

A packet of death scenario is possible in mvfst via a specially crafted message during a QUIC session, which causes a crash via a failed assertion. Per QUIC specification, this particular message should be treated as a connection error. This issue affects mvfst versions prior to commit a67083ff4b8dcbb7ee2839da6338032030d712b0 and proxygen versions prior to v2021.03.15.00.

References

facebookincubator/mvfst commit a67083f · Patch
facebook.com/security/advisories/cve-2021-24029 · Vendor Advisory

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