7.5

CVE-2021-24029: facebook mvfst Reachable Assertion

CVSS: 7.5v3.1HighModified
Published 15-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-24029 is a high (CVSS 7.5) Reachable Assertion vulnerability in facebook mvfst. EPSS estimates a 1.19% chance of exploitation in the next 30 days, higher than 67.3% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.19%

Chance of exploitation in the next 30 days

Percentile

67%

Versus all other CVEs

30-day change

0.00 pp

From 1.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Facebook2 products
  • mvfst≥ unspecified, < a67083ff4b8dcbb7ee2839da6338032030d712b0 | < 2021-03-13
  • proxygen≥ unspecified, < v2021.03.15.00 | < 2021.03.15.00

1 vendor · 2 products

References

2 links