CVE-2020-7451: Freebsd

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

In FreeBSD 12.1-STABLE before r358739, 12.1-RELEASE before 12.1-RELEASE-p3, 11.3-STABLE before r358740, and 11.3-RELEASE before 11.3-RELEASE-p7, a TCP SYN-ACK or challenge TCP-ACK segment over IPv6 that is transmitted or retransmitted does not properly initialize the Traffic Class field disclosing one byte of kernel memory over the network.

Affected products

• Freebsd Freebsd: version 11.3 only; version 12.1 only

Published 2020-04-28. Last modified 2026-06-17.