7.8

CVE-2021-29631: freebsd Use of Uninitialized Resource

CVSS: 7.8v3.1HighModified
Published 30-08-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-29631 is a high (CVSS 7.8) Use of Uninitialized Resource vulnerability in freebsd. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 19.9% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.29%
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. 30-08-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

In FreeBSD 13.0-STABLE before n246941-20f96f215562, 12.2-STABLE before r370400, 11.4-STABLE before r370399, 13.0-RELEASE before p4, 12.2-RELEASE before p10, and 11.4-RELEASE before p13, certain VirtIO-based device models in bhyve failed to handle errors when fetching I/O descriptors. A malicious guest may cause the device model to operate on uninitialized I/O vectors leading to memory corruption, crashing of the bhyve process, and possibly arbitrary code execution in the bhyve process.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.29%

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
  • freebsdEOL11.4 | 11.4:p1 | 11.4:p10 | 11.4:p11 | 11.4:p12 | 11.4:p13 | 11.4:p2 | 11.4:p3 | 11.4:p4 | 11.4:p5 | 11.4:p6 | 11.4:p7 | 11.4:p8 | 11.4:p9 | 12.2 | 12.2:p1 | 12.2:p10 | 12.2:p2 | 12.2:p3 | 12.2:p4 | 12.2:p5 | 12.2:p6 | 12.2:p7 | 12.2:p8 | 12.2:p9 | 13.0 | 13.0:p1 | 13.0:p2 | 13.0:p3

1 vendor · 1 product

References

2 links