CVE-2021-4305: A vulnerability was found in Woorank robots-txt-guard

Q: How do I fix CVE-2021-4305?

robots-txt-guard: upgrade to 2021-02-07. Exact commands for each OS are on this page.

Q: Is CVE-2021-4305 being exploited?

CVE-2021-4305 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4305 affect?

CVE-2021-4305 affects robots-txt-guard. Severity is low (CVSS 3.5). 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 regul

Q: How urgent is CVE-2021-4305?

Priority 28/100. No elevated risk signals yet.

Routine

LOW 3.5UPGRADE

CVE-2021-4305 is a low-severity flaw (CVSS 3.5) affecting robots-txt-guard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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. T

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-1333
Published	2023-01-05
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: bridgeline

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-05 11:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

bridgeline robots-txt-guard UPGRADE

Affected: < 2021-02-07

Fixed in: 2021-02-07

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy robots-txt-guard || rpm -q robots-txt-guard || robots-txt-guard --version

2. UPGRADE to 2021-02-07 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade robots-txt-guard

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade robots-txt-guard

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4305?

robots-txt-guard: upgrade to 2021-02-07. Exact commands for each OS are on this page.

Is CVE-2021-4305 being exploited?

CVE-2021-4305 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4305 affect?

CVE-2021-4305 affects robots-txt-guard. Severity is low (CVSS 3.5). 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 regul

How urgent is CVE-2021-4305?

Priority 28/100. No elevated risk signals yet.

References

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