CVE-2021-4000

Name: CVE-2021-4000
Creator: NVD / NIST
Published: 2021-12-03T11:15:07.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.82%

Last modified Jun 17, 2026

CVE-2021-4000 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. showdoc is vulnerable to URL Redirection to Untrusted Site. EPSS estimates a 0.82% chance of exploitation in the next 30 days.

Description

showdoc is vulnerable to URL Redirection to Untrusted Site

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

0.82%

52.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-601

Affected Software

Vendor	Product	Versions
Showdoc	Showdoc	All versions

References

https://github.com/star7th/showdoc/commit/c7f10033eba5f2b5a537f9af9ba2379138e67138Patch, Third Party Advisory
https://huntr.dev/bounties/e4d803e0-3104-432c-80b3-34bc453c8962Exploit, Third Party Advisory
https://github.com/star7th/showdoc/commit/c7f10033eba5f2b5a537f9af9ba2379138e67138Patch, Third Party Advisory
https://huntr.dev/bounties/e4d803e0-3104-432c-80b3-34bc453c8962Exploit, Third Party Advisory

Timeline

Published: Dec 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4000?

showdoc is vulnerable to URL Redirection to Untrusted Site

How severe is CVE-2021-4000?

CVE-2021-4000 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4000?

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-2021-4000?

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

Scan your code now

Source: NVD / NIST