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-87

This month

HIGH 8.8UPGRADE

CVE-2021-25980 is a high-severity flaw (CVSS 8.8) affecting talkyard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 31%)
CISA exploited list	No
Weakness	CWE-74
Published	2021-11-11
Last modified	2026-06-17

Publisher (CNA): Mend · Vendor: talkyard

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-11 07:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

talkyard talkyard UPGRADE

Affected: >= 0.04.01 and <= 0.6.74-wip-63220cb · >= 0.2020.22-wip-b2e97fe0e and <= 0.2021.02-wip-879ef3fe1 · >= tyse-v0.2021.02-879ef3fe1-regular and <= tyse-v0.2021.28-af66b6905-regular

Fixed in: newer than tyse-v0.2021.28-af66b6905-regular

Safe to downgrade to: a release before 0.04.01

1. Check installed version

apt-cache policy talkyard || rpm -q talkyard || talkyard --version

2. UPGRADE to newer than tyse-v0.2021.28-af66b6905-regular (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade talkyard

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade talkyard

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.04.01 (Debian / Ubuntu)

apt-cache madison talkyard sudo apt install talkyard=<VERSION_BEFORE_0.04.01> sudo apt-mark hold talkyard

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list talkyard sudo dnf downgrade talkyard-<VERSION_BEFORE_0.04.01> sudo dnf versionlock add talkyard

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25980?

talkyard: upgrade to newer than tyse-v0.2021.28-af66b6905-regular. Exact commands for each OS are on this page.

Is CVE-2021-25980 being exploited?

CVE-2021-25980 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25980 affect?

CVE-2021-25980 affects talkyard. Severity is high (CVSS 8.8). 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.

How urgent is CVE-2021-25980?

Priority 48/100. High severity

Related CVEs

CVE-2021-25981 CRITICAL 9.8 UPGRADE In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, ar

References

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