Is CVE-2021-25979 actively exploited?

No active exploitation of CVE-2021-25979 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-25979 be exploited remotely?

Yes. CVE-2021-25979 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-25979?

CVE-2021-25979 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-25979

CRITICAL

CVE-2021-25979

CWE-613Published: November 8, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Apostrophe CMS versions prior to 3.3.1 did not invalidate existing login sessions when disabling a user account or changing the password, creating a situation in which a device compromised by a third party could not be locked out by those means. As a mitigation for older releases the user account in question can be archived (3.x) or moved to the trash (2.x and earlier) which does disable the existing session.

NVD Source

Technical Analysis

CVE-2021-25979 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.