CVE-2021-25980

Name: CVE-2021-25980
Creator: NVD / NIST
Published: 2021-11-11T07:15:11.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.21%

Last modified Jun 17, 2026

CVE-2021-25980 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. In Talkyard, versions v0.04.01 through v0.6.74-WIP-63220cb, v0.2020.22-WIP-b2e97fe0e through v0.2021.02-WIP-879ef3fe1 and tyse-v0.2021.02-879ef3fe1-regular through tyse-v0.2021.28-af66b6905-regular, are vulnerable to Host Header Injection. By luring a victim application-user to click on a link, an unauthenticated attacker can use the “forgot password” functionality to reset the victim’s password and successfully take over their account.. EPSS estimates a 1.21% chance of exploitation in the next 30 days.

Description

In Talkyard, versions v0.04.01 through v0.6.74-WIP-63220cb, v0.2020.22-WIP-b2e97fe0e through v0.2021.02-WIP-879ef3fe1 and tyse-v0.2021.02-879ef3fe1-regular through tyse-v0.2021.28-af66b6905-regular, are vulnerable to Host Header Injection. By luring a victim application-user to click on a link, an unauthenticated attacker can use the “forgot password” functionality to reset the victim’s password and successfully take over their account.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.21%

64.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Talkyard	Talkyard	>= 0.04.01, <= 0.6.74-wip-63220cb
Talkyard	Talkyard	>= 0.2020.22-wip-b2e97fe0e, <= 0.2021.02-wip-879ef3fe1
Talkyard	Talkyard	>= tyse-v0.2021.02-879ef3fe1-regular, <= tyse-v0.2021.28-af66b6905-regular

References

https://github.com/debiki/talkyard/commit/4067e191a909ed06f250d09a40e43aa5edbb0289Patch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25980Third Party Advisory
https://github.com/debiki/talkyard/commit/4067e191a909ed06f250d09a40e43aa5edbb0289Patch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25980Third Party Advisory

Timeline

Published: Nov 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25980?

How severe is CVE-2021-25980?

CVE-2021-25980 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25980?

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-2021-25980?

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

Scan your code now

Source: NVD / NIST