Use After Free in FreeBSD

CVE-2020-7462

In 11.4-PRERELEASE before r360733 and 11.3-RELEASE before p13, improper mbuf handling in the kernel causes a use-after-free bug by sending IPv6 Hop-by-Hop options over the loopback interface. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.

Vulnerability class: Use-After-Free

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (11.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-7462: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • FreeBSD — versions 11.3, 11.4
  • FreeBSD — versions FreeBSD 11.3-RELEASE before p13

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2020-7462?
CVE-2020-7462 is a medium-severity vulnerability in FreeBSD, classified under Use After Free. CVSS score: 5.5/10. Published 2021-03-26.
How severe is CVE-2020-7462?
Medium severity. CVSS v3 base score is 5.5 out of 10.