What is CVE-2021-3346?

CVE-2021-3346 is a critical-severity vulnerability in Nic Foris. CVSS score: 9.8/10. Published 2021-01-29.

How severe is CVE-2021-3346?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Nic Foris

CVE-2021-3346

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

Published 2021-01-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Nic Foris

References

www.turris.com/ (Product)
gitlab.nic.cz/turris/foris/foris/-/issues/201 (Third Party Advisory, Broken Link)
gitlab.nic.cz/turris/foris/foris/-/blob/master/CHANGELOG.rst (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-3346?: CVE-2021-3346 is a critical-severity vulnerability in Nic Foris. CVSS score: 9.8/10. Published 2021-01-29.
How severe is CVE-2021-3346?: Critical severity. CVSS v3 base score is 9.8 out of 10.