Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2021-29454

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Published: Jan 10, 2022 | Modified: Nov 21, 2024
CVSS 3.x
8.8
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
6.5 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu
HIGH
Vulnerability-free packages from our partners
root.io logo minimus.io logo echo.ai logo
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-29454
CWEhttps://cwe.mitre.org/data/definitions/74.html

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.42 and 4.0.2, template authors could run arbitrary PHP code by crafting a malicious math string. If a math string was passed through as user provided data to the math function, external users could run arbitrary PHP code by crafting a malicious math string. Users should upgrade to version 3.1.42 or 4.0.2 to receive a patch.

Weakness

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Affected Software

NameVendorStart VersionEnd Version
SmartySmarty*3.1.42 (excluding)
SmartySmarty4.0.0 (including)4.0.2 (excluding)
Smarty3Ubuntubionic*
Smarty3Ubuntudevel*
Smarty3Ubuntuesm-apps/bionic*
Smarty3Ubuntuesm-apps/focal*
Smarty3Ubuntuesm-apps/jammy*
Smarty3Ubuntuesm-apps/noble*
Smarty3Ubuntuesm-apps/xenial*
Smarty3Ubuntufocal*
Smarty3Ubuntuhirsute*
Smarty3Ubuntuimpish*
Smarty3Ubuntujammy*
Smarty3Ubuntukinetic*
Smarty3Ubuntulunar*
Smarty3Ubuntumantic*
Smarty3Ubuntunoble*
Smarty3Ubuntuoracular*
Smarty3Ubuntuplucky*
Smarty3Ubuntutrusty*
Smarty3Ubuntuupstream*
Smarty3Ubuntuxenial*

Potential Mitigations

References

Aqua Security is the largest pure-play cloud native security company, providing customers the freedom to innovate and run their businesses with minimal friction. The Aqua Cloud Native Security Platform provides prevention, detection, and response automation across the entire application lifecycle to secure the build, secure cloud infrastructure and secure running workloads wherever they are deployed.
Copyright © 2026 Aqua Security Software Ltd.   Privacy Policy | Terms of Use