CVE-2021-4271

Name: CVE-2021-4271
Creator: NVD / NIST
Published: 2022-12-21T19:15:13.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2021-4271 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A vulnerability was found in panicsteve w2wiki. It has been rated as problematic. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

A vulnerability was found in panicsteve w2wiki. It has been rated as problematic. Affected by this issue is the function toHTML of the file index.php of the component Markdown Handler. The manipulation leads to cross site scripting. The attack may be launched remotely. The name of the patch is 8f1d0470b4ddb1c7699e3308e765c11ed29542b6. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-216476.

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

0.34%

26.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
W2wiki Project	W2wiki	All versions

References

https://github.com/panicsteve/w2wiki/commit/8f1d0470b4ddb1c7699e3308e765c11ed29542b6Patch, Third Party Advisory
https://vuldb.com/?id.216476Third Party Advisory
https://github.com/panicsteve/w2wiki/commit/8f1d0470b4ddb1c7699e3308e765c11ed29542b6Patch, Third Party Advisory
https://vuldb.com/?id.216476Third Party Advisory

Timeline

Published: Dec 21, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4271?

How severe is CVE-2021-4271?

CVE-2021-4271 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4271?

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-2021-4271?

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

Scan your code now

Source: NVD / NIST