Is CVE-2020-25577 actively exploited?

No active exploitation of CVE-2020-25577 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-25577 be exploited remotely?

Yes. CVE-2020-25577 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-25577?

CVE-2020-25577 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-25577

CRITICAL

CVE-2020-25577

CWE-120Published: March 29, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

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.

NVD Source

Technical Analysis

CVE-2020-25577 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.