Vulnerability · Published Apr 28, 2020 · Assigned by freebsd

CVE-2020-7451

Medium 5.3

In plain English

A medium-severity security flaw in FreeBSD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 68% of all known vulnerabilities).

Severity (CVSS NVD)5.3Medium

Exploit odds (30 days)1.2%top 32.5% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
n/a	FreeBSD	12.1-STABLE before r358739, 12.1-RELEASE before 12.1-RELEASE-p3, 11.3-STABLE before r358740, 11.3-RELEASE before 11.3-RELEASE-p7

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:04.tcp.asc x_refsource_CONFIRM