CVE-2021-33502
HIGHCVSS 7.5/10EPSS 1.70%
Last modified
CVE-2021-33502 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.70% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Normalize-Url Project | Normalize-Url | >= 4.3.0, < 4.5.1 |
| Normalize-Url Project | Normalize-Url | >= 5.0.0, < 5.3.1 |
| Normalize-Url Project | Normalize-Url | 6.0.0 |
References
- https://github.com/sindresorhus/normalize-url/releases/tag/v6.0.1Release Notes, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210706-0001/Third Party Advisory
- https://github.com/sindresorhus/normalize-url/releases/tag/v6.0.1Release Notes, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210706-0001/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-33502?
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.
How severe is CVE-2021-33502?
CVE-2021-33502 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.70% probability of exploitation in the next 30 days.
How do I fix CVE-2021-33502?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-33502?
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Scan your code nowSource: NVD / NIST