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CVE-2021-24029

HIGH
7.5
CVSS Score
Published: March 15, 2021 at 09:15 PM UTC
Updated: June 17, 2026 at 03:39 AM UTC
2 products affected across 2 vendorsProxygenMvfst

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mvfst· Facebook
95%
v < 2021-3-13
Affected range stops below 2021-3-13, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in a67083ff4b8dcbb7ee2839da6338032030d712b0 (unaffected)
Proxygen· Proxygen Project
95%
v < 2021.03.15.00v < v2021.03.15.00
Affected range stops below 2021.03.15.00, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in v2021.03.15.00 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.facebook.com/security/advisories/cve-2021-24029

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-617

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