Is CVE-2020-25583 actively exploited?

No active exploitation of CVE-2020-25583 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-25583 be exploited remotely?

Yes. CVE-2020-25583 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-25583?

CVE-2020-25583 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-25583

CRITICAL

CVE-2020-25583

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 when processing a DNSSL option, rtsold(8) decodes domain name labels per an encoding specified in RFC 1035 in which the first octet of each label contains the label's length. rtsold(8) did not validate label lengths correctly and could overflow the destination buffer.

NVD Source

Technical Analysis

CVE-2020-25583 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.