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Public proof of concept

CVE-2020-7661

A public proof of concept exists; no exploitation attested.

  • Published2020-06-04
  • WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

all versions of url-regex are vulnerable to Regular Expression Denial of Service. An attacker providing a very long string in String.test can cause a Denial of Service.

Timeline

dates in UTC
  1. 2020-06-0418:15CVE publishedNVD

Versions per branch

OSV · NVD
url-regex
BranchAffectedFixed in
5.0≤ 5.0.0no fix published
Url-regex project url-regex
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-06-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-v4rh-8p82-6h5w

Frequently asked questions

What is CVE-2020-7661?

all versions of url-regex are vulnerable to Regular Expression Denial of Service. An attacker providing a very long string in String.test can cause a Denial of Service.

Is CVE-2020-7661 actively exploited?

Active exploitation of CVE-2020-7661 has not been confirmed. Its EPSS score was 2.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-7661?

CVE-2020-7661 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record