Is CVE-2021-29454 in the CISA KEV catalog?

No. CVE-2021-29454 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29454?

CVE-2021-29454 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-29454?

CVE-2021-29454 has an EPSS score of 1.93% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29454?

Upgrade smarty3 on debian 11 to 3.1.39-2+deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29454

HIGHEPSS 78th pctl

8.1

CVSS v3

NVD

Description

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.

CWE-74Injection

How to fix

Remediation Available

smarty3Debian

Fixed in:3.1.39-2+deb11u1CVE-2021-29454

Fixed in:3.1.45-1CVE-2021-29454

smarty3Ubuntu

Fixed in:3.1.21-1ubuntu1+esm1USN-5348-2

Fixed in:3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1USN-5348-1

Fixed in:3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1USN-5348-3

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.93%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

smarty.net

Third-Party Advisory7

Other references2

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2251	Critical	9.8	100%	KEV	Fix
CVE-2023-22527	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-2725	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2022-35914	Critical	9.8	100%	KEV	-
CVE-2019-17558	High	7.5	99%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.