How severe is CVE-2021-25980?

CVE-2021-25980 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25980 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25980?

CVE-2021-25980 affects Talkyard. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25980?

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

When was CVE-2021-25980 published?

CVE-2021-25980 was published on 2021-11-11 and last updated on 2026-06-17.

CVE-2021-25980

CVE-2021-25980 is a high-severity vulnerability in Talkyard with a CVSS 3.x base score of 8.8. 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-74.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Talkyard
Published: 2021-11-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-25980?: 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.
How severe is CVE-2021-25980?: CVE-2021-25980 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25980 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25980?: CVE-2021-25980 affects Talkyard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25980?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-25980 published?: CVE-2021-25980 was published on 2021-11-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:talkyard:talkyard:*:*:*:*:*:*:*:*

More vulnerabilities in Talkyard

CVE-2021-25981 — Critical (CVSS 9.8): In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, are…

All CVEs affecting Talkyard →

Other CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities

CVE-2026-114575 — Critical (CVSS 10.0): A flaw has been found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by this issue is the function…
CVE-2026-108918 — Critical (CVSS 10.0): A vulnerability was identified in Edimax BR-6208AC 1.32. Impacted is an unknown function of the file…
CVE-2026-108917 — Critical (CVSS 10.0): A vulnerability was determined in Edimax BR-6208AC 1.32. This issue affects some unknown processing of the file…
CVE-2026-105135 — Critical (CVSS 10.0): A vulnerability has been found in InternLM MindSearch 0.1.0. This issue affects the function ExecutionAction.run of the…
CVE-2026-61732 — Critical (CVSS 10.0): Decepticon is an autonomous hacking agent for red teams. Versions prior to 1.1.17 wrap web crawl results — the output…
CVE-2026-94097 — Critical (CVSS 10.0): A vulnerability was determined in Netcore NBR200V2 1.3.241127.071246. This affects an unknown part of the file…

Browse all CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities →