CVE-2021-21408

smarty3: Smarty is a template engine for PHP, facilitating the separation ofpresentation (HTML/CSS) from application logic

CVE-2021-21408 is fixed in 2 products on 1 platform, first by smarty3 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1, released January 10, 2022. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
8.8
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0214
82nd percentile

Smarty is a template engine for PHP, facilitating the separation ofpresentation (HTML/CSS) from application logic. Prior to versions 3.1.43and 4.0.3, template authors could run restricted static php methods. Usersshould upgrade to version 3.1.43 or 4.0.3 to receive a patch.

Where it's fixed

ProductFixed inFixReleased
Linux
smarty3 · Debian 11.6 (bullseye) 3.1.39-2+deb11u1 DSA-5151-1 May 29, 2022
smarty3 · Debian 12.15 (bookworm) 3.1.45-1 DEBIAN-CVE-2021-21408 Jan 10, 2022
smarty3 · Debian 13.5 (trixie) 3.1.45-1 DEBIAN-CVE-2021-21408 Jan 10, 2022
smarty3 · Debian 14 3.1.45-1 DEBIAN-CVE-2021-21408 Jan 10, 2022
smarty3 · Ubuntu 18.04.6 LTS (bionic) 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1 smarty3 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1 Jan 10, 2022
smarty3 · Ubuntu 20.04 LTS (focal) 3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1 smarty3 3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1 Jan 10, 2022
smarty3 · Ubuntu 22.04.1 LTS (jammy) 3.1.39-2ubuntu1 smarty3 3.1.39-2ubuntu1 Jan 10, 2022
smarty3 · Ubuntu 24.10 (oracular) 3.1.39-2ubuntu1 smarty3 3.1.39-2ubuntu1 Jan 16, 2026
smarty3 · Ubuntu 25.04 (plucky) 3.1.39-2ubuntu1 smarty3 3.1.39-2ubuntu1 Jan 16, 2026
smarty4 · Debian 12.15 (bookworm) 4.1.1-1 DEBIAN-CVE-2021-21408 Jan 10, 2022
smarty4 · Debian 13.5 (trixie) 4.1.1-1 DEBIAN-CVE-2021-21408 Jan 10, 2022
smarty4 · Debian 14 4.1.1-1 DEBIAN-CVE-2021-21408 Jan 10, 2022

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