7.5

CVE-2021-33502: normalize-url_project normalize-url

Modified
AliasesUBUNTU-CVE-2021-33502DEBIAN-CVE-2021-33502GHSA-px4h-xg32-q955
Published 24-05-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-33502 is a high (CVSS 7.5) vulnerability in normalize-url_project normalize-url. EPSS estimates a 1.70% chance of exploitation in the next 30 days, higher than 77.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.70%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7
RHSA-2021:2931RHSA-2021:2932RHSA-2021:5171RHSA-2022:0246RHSA-2022:0350RHSA-2022:4711

Timeline

  1. 24-05-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

The normalize-url package before 4.5.1, 5.x before 5.3.1, and 6.x before 6.0.1 for Node.js has a ReDoS (regular expression denial of service) issue because it has exponential performance for data: URLs.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.70%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.70% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu2 products
  • node-gotAll versions (No fix recorded)
  • node-yarnpkgAll versions (No fix recorded)
Debian1 product
  • node-got< 11.8.1+~cs53.13.17-3
Normalize-url_project1 product
Npm1 product
  • normalize-url≥ 4.3.0, < 4.5.1 | ≥ 5.0.0, < 5.3.1 | ≥ 6.0.0, < 6.0.1

4 vendors · 5 products

References

9 links