CVE-2021-4305

Name: CVE-2021-4305
Creator: NVD / NIST
Published: 2023-01-05T11:15:09.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.94%

Last modified Jun 17, 2026

CVE-2021-4305 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability was found in Woorank robots-txt-guard. It has been rated as problematic. EPSS estimates a 0.94% chance of exploitation in the next 30 days.

Description

A vulnerability was found in Woorank robots-txt-guard. It has been rated as problematic. Affected by this issue is the function makePathPattern of the file lib/patterns.js. The manipulation of the argument pattern leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. The name of the patch is c03827cd2f9933619c23894ce7c98401ea824020. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-217448.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.94%

56.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1333

Affected Software

Vendor	Product	Versions
Bridgeline	Robots-Txt-Guard	< 2021-02-07

References

https://github.com/Woorank/robots-txt-guard/commit/c03827cd2f9933619c23894ce7c98401ea824020Patch, Third Party Advisory
https://github.com/Woorank/robots-txt-guard/pull/4Patch, Third Party Advisory
https://vuldb.com/?ctiid.217448Permissions Required, Third Party Advisory
https://vuldb.com/?id.217448Third Party Advisory
https://github.com/Woorank/robots-txt-guard/commit/c03827cd2f9933619c23894ce7c98401ea824020Patch, Third Party Advisory
https://github.com/Woorank/robots-txt-guard/pull/4Patch, Third Party Advisory
https://vuldb.com/?ctiid.217448Permissions Required, Third Party Advisory
https://vuldb.com/?id.217448Third Party Advisory

Timeline

Published: Jan 5, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4305?

How severe is CVE-2021-4305?

CVE-2021-4305 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4305?

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-2021-4305?

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

Scan your code now

Source: NVD / NIST