How severe is CVE-2021-25979?

CVE-2021-25979 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25979 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25979?

CVE-2021-25979 affects Apostrophecms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25979?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-25979 published?

CVE-2021-25979 was published on 2021-11-08 and last updated on 2026-06-17.

CVE-2021-25979

CVE-2021-25979 is a critical-severity vulnerability in Apostrophecms with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-613.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-613
Affected product: Apostrophecms
Published: 2021-11-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-25979?: 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.
How severe is CVE-2021-25979?: CVE-2021-25979 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25979 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25979?: CVE-2021-25979 affects Apostrophecms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25979?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-25979 published?: CVE-2021-25979 was published on 2021-11-08 and last updated on 2026-06-17.

References

https://github.com/apostrophecms/apostrophe/commit/c211b211f9f4303a77a307cf41aac9b4ef8d2c7c

Affected products (1)

cpe:2.3:a:apostrophecms:apostrophecms:*:*:*:*:*:*:*:*

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