5.5

CVE-2021-29626: freebsd Use After Free

CVSS: 5.5v3.1MediumModified
Published 07-04-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-29626 is a medium (CVSS 5.5) Use After Free vulnerability in freebsd. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 25.7% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.34%
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. 07-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

In FreeBSD 13.0-STABLE before n245117, 12.2-STABLE before r369551, 11.4-STABLE before r369559, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, copy-on-write logic failed to invalidate shared memory page mappings between multiple processes allowing an unprivileged process to maintain a mapping after it is freed, allowing the process to read private data belonging to other processes or the kernel.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

0.00 pp

From 0.34% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.34%

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

Freebsd1 product
  • freebsdEOL< 11.4 | ≥ 12.0, < 12.2 | 11.4 | 11.4:beta1 | 11.4:p1 | 11.4:p2 | 11.4:p3 | 11.4:p4 | 11.4:p5 | 11.4:rc1 | 11.4:rc2 | 12.2 | 12.2:p1 | 12.2:p2 | 13.0:beta1 | 13.0:beta2 | 13.0:beta3 | 13.0:beta4 | 13.0:rc1 | 13.0:rc2 | 13.0:rc3 | 13.0:rc4 | 13.0:rc5

1 vendor · 1 product

References

2 links