HOMEVULNERABILITIESCVE-2021-24029
HIGH

CVE-2021-24029

CWE-617Published: March 15, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-24029 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

facebook2 product(s)
mvfstproxygen
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0
PATCHhttps://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0
ADVISORYhttps://www.facebook.com/security/advisories/cve-2021-24029
ADVISORYhttps://www.facebook.com/security/advisories/cve-2021-24029

All References (4)

→
https://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0Patch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2021-24029Vendor Advisory
→
https://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0Patch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2021-24029Vendor Advisory

Quick Facts

CVE IDCVE-2021-24029
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-617
CISA KEVNo
Affected1 vendor(s)
PublishedMar 15, 2021

Related CVEs (CWE-617)

CVE-2020-3615
9.8
CVE-2019-9795
9.8
CVE-2020-6619
8.8
CVE-2020-6617
8.8
CVE-2020-6623
8.8
CVE-2020-12417
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-24029 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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