Vulnerability · Published Mar 29, 2021 · Assigned by freebsd

CVE-2020-25577

Critical 9.8

In plain English

A critical-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 1.5% (higher than 74% of all known vulnerabilities).

Severity (CVSS NVD)9.8Critical

Exploit odds (30 days)1.5%top 25.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

In FreeBSD 12.2-STABLE before r368250, 11.4-STABLE before r368253, 12.2-RELEASE before p1, 12.1-RELEASE before p11 and 11.4-RELEASE before p5 rtsold(8) does not verify that the RDNSS option does not extend past the end of the received packet before processing its contents. While the kernel currently ignores such malformed packets, it passes them to userspace programs. Any programs expecting the kernel to do validation may be vulnerable to an overflow.

Affected products (as reported)

Vendor	Product	Versions
n/a	FreeBSD	FreeBSD 12.2-RELEASE before p1, 12.1-RELEASE before p11, 11.4-RELEASE before p5

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:32.rtsold.asc x_refsource_MISC
https://security.netapp.com/advisory/ntap-20210423-0001/ x_refsource_CONFIRM