CVE-2020-25577

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-29 · updated 2026-06-17
Weakness: CWE-120

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

FreeBSD: 11.4, 11.4-p1, 11.4-p2, 11.4-p3, 12.1, 12.1-p1 (+9)

References

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

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