CVE-2021-3346: Foris before 101.1.1, as used in Turris OS, lacks certain HTML escaping in the login template.

Q: How do I fix CVE-2021-3346?

foris: upgrade to 101.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-3346 being exploited?

CVE-2021-3346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-3346 affect?

CVE-2021-3346 affects foris. Severity is critical (CVSS 9.8). Foris before 101.1.1, as used in Turris OS, lacks certain HTML escaping in the login template.

Q: How urgent is CVE-2021-3346?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-3346 is a critical-severity flaw (CVSS 9.8) affecting foris. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Foris before 101.1.1, as used in Turris OS, lacks certain HTML escaping in the login template.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Published	2021-01-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nic

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

Am I affected?

Timeline

2021-01-29 17:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

nic foris UPGRADE

Affected: < 101.1

Fixed in: 101.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 101.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade foris

Note

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

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-2021-3346?

foris: upgrade to 101.1. Exact commands for each OS are on this page.

Is CVE-2021-3346 being exploited?

CVE-2021-3346 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-2021-3346 affect?

CVE-2021-3346 affects foris. Severity is critical (CVSS 9.8). Foris before 101.1.1, as used in Turris OS, lacks certain HTML escaping in the login template.

How urgent is CVE-2021-3346?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

References

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