CVE-2021-25979Network attack vector

Persistent account access via unrevoked login sessions

Published Nov 8, 2021 · Updated Apr 30, 2025

Insufficient session expiration in ApostropheCMS before 3.3.1 allows remote attackers holding a stolen session to retain account access. The user-account update path changes a password or disables an account without invalidating its already issued login sessions. Possession of a valid session cookie is required; the session remains usable for the compromised account until another revocation path ends it.

CVSS severity9.8
Critical
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in ApostropheCMS before 3.3.1 allows remote attackers holding a stolen session to retain account access. The user-account update path changes a password or disables an account without invalidating its already issued login sessions. Possession of a valid session cookie is required; the session remains usable for the compromised account until another revocation path ends it.

The record

CVE
CVE-2021-25979
Published
Nov 8, 2021
Updated
Apr 30, 2025
Vendor
Apostrophe Technologies
Product
ApostropheCMS
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.63.0 <unspecified
  2. Affected versionversion=unspecified <=3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apostrophe Technologies · ApostropheCMSversion=2.63.0 <unspecified; version=unspecified <=3.3.1

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8MendCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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