CVE-2021-21408

unknown

Published 2022-01-12 · Modified 2026-03-13

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

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

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`3.1.45-1`
debian	bullseye	fixed	`3.1.39-2+deb11u1`
debian	forky	fixed	`3.1.45-1`
debian	sid	fixed	`3.1.45-1`
debian	trixie	fixed	`3.1.45-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Packagist	smarty/smarty	`<3.1.43`	`3.1.43`
Packagist	smarty/smarty	`>=4.0.0,<4.0.3`	`4.0.3`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.