CVE-2021-23803

Name: CVE-2021-23803
Creator: NVD / NIST
Published: 2021-12-17T20:15:08.287+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.58%

Last modified Jun 17, 2026

CVE-2021-23803 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. EPSS estimates a 1.58% chance of exploitation in the next 30 days.

Description

This affects the package latte/latte before 2.10.6. There is a way to bypass allowFunctions that will affect the security of the application. When the template is set to allow/disallow the use of certain functions, adding control characters (x00-x08) after the function will bypass these restrictions.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.58%

72.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Nette	Latte	< 2.10.6

References

https://github.com/nette/latte/commit/227c86eda9a8a6d060ea8501923e768b6d992210Patch, Third Party Advisory
https://github.com/nette/latte/issues/279Exploit, Issue Tracking, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-PHP-LATTELATTE-1932226Exploit, Patch, Third Party Advisory
https://github.com/nette/latte/commit/227c86eda9a8a6d060ea8501923e768b6d992210Patch, Third Party Advisory
https://github.com/nette/latte/issues/279Exploit, Issue Tracking, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-PHP-LATTELATTE-1932226Exploit, Patch, Third Party Advisory

Timeline

Published: Dec 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23803?

How severe is CVE-2021-23803?

CVE-2021-23803 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23803?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23803?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST