TI-2021-06346 Aliases CVE-2021-24029 GHSA-hjc6-5p5c-w4wg

Reachable assertion in Meta mvfst

LOW 35CWE-617Published 2021-03-15 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-617.

Summary

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.

Why it matters now

EPSS 0.01186 68th percentileScored 2026-11-07

Fix Fixed mvfst (Facebook): a67083ff4b8dcbb7ee2839da6338032030d712b0proxygen (Facebook): v2021.03.15.00

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Meta	mvfst	before a67083ff4b8dcbb7ee2839da6338032030d712b0	a67083ff4b8dcbb7ee2839da6338032030d712b0	Patch available	CNA
Meta	proxygen	before v2021.03.15.00	v2021.03.15.00	Patch available	CNA

mvfst VendorMeta Affected before a67083ff4b8dcbb7ee2839da6338032030d712b0 Fixed in a67083ff4b8dcbb7ee2839da6338032030d712b0 Patch available CNA
proxygen VendorMeta Affected before v2021.03.15.00 Fixed in v2021.03.15.00 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:facebook:mvfst::::::::	before 2021-03-13	Vulnerable	Meta
cpe:2.3:a:facebook:proxygen::::::::	before 2021.03.15.00	Vulnerable	Meta

cpe:2.3:a:facebook:mvfst:*:*:*:*:*:*:*:* Versions before 2021-03-13 Vulnerable ·Meta
cpe:2.3:a:facebook:proxygen:*:*:*:*:*:*:*:* Versions before 2021.03.15.00 Vulnerable ·Meta

Remediation

Fix · CNA mvfst (Facebook) Fixed in a67083ff4b8dcbb7ee2839da6338032030d712b0
Fix · CNA proxygen (Facebook) Fixed in v2021.03.15.00

Timeline

2026-10-02 Threatist record created from CVE-2021-24029
2026-10-03 Alias added: GHSA-hjc6-5p5c-w4wg

References

Patch 1

https://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0

Advisory 1

https://www.facebook.com/security/advisories/cve-2021-24029

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences