CVE-2021-25980

mediumpriority · track · 35EPSS 0.013 · 69 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.25% (69th) EPSS

CVSS 6.8 · medium

Is it mine?

7 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · vulnerabilitylab@mend.ioexploitability 2.8 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-74USprimary

affected products (7)

Products and version ranges known to be affected.

debiki talkyard≤ v0.2021 ≤v0.2021.02-WIP-879ef3fe1enisa_euvdEU
debiki talkyardtyse-v0.2021.02-879ef3fe1-regular → tyse-v0.2021*enisa_euvdEU
debiki talkyardv0.04.01 → v0*enisa_euvdEU
debiki talkyardv0.2020.22-WIP-b2e97fe0e → v0.2020*enisa_euvdEU
talkyard talkyard0.04.01 → 0.6.74-wip-63220cbnvdUScpe:2.3:a:talkyard:talkyard:*:*:*:*:*:*:*:*
talkyard talkyard0.2020.22-wip-b2e97fe0e → 0.2021.02-wip-879ef3fe1nvdUScpe:2.3:a:talkyard:talkyard:*:*:*:*:*:*:*:*
talkyard talkyardtyse-v0.2021.02-879ef3fe1-regular → tyse-v0.2021.28-af66b6905-regularnvdUScpe:2.3:a:talkyard:talkyard:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-11-11modified 2026-06-17

related (5,984)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2025-20337US	—OT critical	74.5% (99th)	KEV	2025-07-16
A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying operating system as roo…
CVE-2025-20281US	—OT critical	97.6% (100th)	KEV	2025-06-25
A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying operating system as roo…
CVE-2023-22527US	critical9.8OT critical	100.0% (100th)	KEV	2024-01-16
A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated attacker to achieve RCE on an affected instance. Customers using…
CVE-2023-48365US	critical9.9OT critical	47.7% (99th)	KEV	2023-11-15
Qlik Sense Enterprise for Windows before August 2023 Patch 2 allows unauthenticated remote code execution, aka QB-21683. Due to improper validation of HTTP headers, a remote attack…
CVE-2023-37580US	medium6.1OT critical	49.1% (99th)	KEV	2023-07-31
Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

+5979 more

references (8)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan