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CVE-2020-36830

24
FAUCET Score

CVE-2020-36830 is a high-severity vulnerability affecting nescalante urlregex versions up to 0.5.0, specifically within the index.js file's Backtracking component. This issue, classified as problematic, stems from inefficient regular expression complexity, leading to a potential denial-of-service (A:H) impact. The vulnerability can be exploited remotely with low attack complexity (AV:N/AC:L), requiring no user interaction or privileges. While the exploit has been publicly disclosed, there is no evidence of active exploitation, and it has received minimal community discussion or media coverage. Upgrading to version 0.5.1 is recommended to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.5.1CPE matchmatch criteria
cpe:2.3:a:nescalante:urlregex:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

5.3MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 28th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: urlregexFixed in: 0.5.1

Vendor Advisories (1)

npmGHSA-rw72-v6c7-hf9rmedium

ReDoS in urlregex

Sep 2, 2024

References

github.com / nescalante/urlregex/commit/e5a085afe6abfaea1d1a78f54c45af9ef43ca1f9
Patch
github.com / nescalante/urlregex/pull/8
Exploit
github.com / nescalante/urlregex/releases/tag/v0.5.1
Release Notes
vuldb.com
Permissions Required
vuldb.com
Third Party Advisory