CVE-2021-23824

Name: CVE-2021-23824
Creator: NVD / NIST
Published: 2022-01-13T15:15:07.867+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.92%

Last modified Jun 17, 2026

CVE-2021-23824 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. This affects the package Crow before 0.3+4. When using attributes without quotes in the template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. EPSS estimates a 0.92% chance of exploitation in the next 30 days.

Description

This affects the package Crow before 0.3+4. When using attributes without quotes in the template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. This may lead to a Cross-site Scripting (XSS) vulnerability, assuming an attacker can influence the value entered into the template. If the template is used to render user-generated content, this vulnerability may escalate to a persistent XSS vulnerability.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.92%

55.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Crowcpp	Crow	< 0.3\+4

References

https://github.com/CrowCpp/Crow/pull/317Issue Tracking, Patch, Third Party Advisory
https://github.com/CrowCpp/Crow/releases/tag/v0.3%2B4Release Notes, Third Party Advisory
https://snyk.io/vuln/SNYK-UNMANAGED-CROW-2336164Exploit, Third Party Advisory
https://github.com/CrowCpp/Crow/pull/317Issue Tracking, Patch, Third Party Advisory
https://github.com/CrowCpp/Crow/releases/tag/v0.3%2B4Release Notes, Third Party Advisory
https://snyk.io/vuln/SNYK-UNMANAGED-CROW-2336164Exploit, Third Party Advisory

Timeline

Published: Jan 13, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23824?

How severe is CVE-2021-23824?

CVE-2021-23824 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23824?

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-2021-23824?

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

Scan your code now

Source: NVD / NIST