CVE-2021-25981

Name: CVE-2021-25981
Creator: NVD / NIST
Published: 2022-01-03T07:15:06.943+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.46%

Last modified Jun 17, 2026

CVE-2021-25981 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, are vulnerable to Insufficient Session Expiration. This may allow an attacker to reuse the admin’s still-valid session token even when logged-out, to gain admin privileges, given the attacker is able to obtain that token (via other, hypothetical attacks). EPSS estimates a 2.46% chance of exploitation in the next 30 days.

Description

In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, are vulnerable to Insufficient Session Expiration. This may allow an attacker to reuse the admin’s still-valid session token even when logged-out, to gain admin privileges, given the attacker is able to obtain that token (via other, hypothetical attacks)

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.46%

82.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Talkyard	Talkyard	>= 0.2021.20, < 0.2021.35

References

https://github.com/debiki/talkyard/commit/b0310df019887f3464895529c773bc7d85ddcf34Patch, Third Party Advisory
https://github.com/debiki/talkyard/commit/b0712915d8a22a20b09a129924e8a29c25ae5761Patch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25981Patch, Third Party Advisory, VDB Entry
https://github.com/debiki/talkyard/commit/b0310df019887f3464895529c773bc7d85ddcf34Patch, Third Party Advisory
https://github.com/debiki/talkyard/commit/b0712915d8a22a20b09a129924e8a29c25ae5761Patch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25981Patch, Third Party Advisory, VDB Entry

Timeline

Published: Jan 3, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25981?

How severe is CVE-2021-25981?

CVE-2021-25981 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25981?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-25981?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST