CVE-2021-33502 ReDoS in normalize-url
Attackers can cause denial of service in applications using the normalize-url package by submitting specially crafted data URLs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-33502?
CVE-2021-33502 is a high-severity denial of service vulnerability in n/a, published on 24 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1333
Which versions are affected by CVE-2021-33502?
6 open source packages ship an affected version, including normalize-url. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
normalize-url npm | From 4.3.0 | 4.5.1 |
normalize-url npm | From 4.3.0 | 4.5.1 |
normalize-url npm | From 5.0.0 | 5.3.1 |
normalize-url npm | From 5.0.0 | 5.3.1 |
normalize-url npm | From 6.0.0 | 6.0.1 |
normalize-url npm | From 6.0.0 | 6.0.1 |
Products include Normalize-Url Project Normalize-Url.
How do I fix CVE-2021-33502?
Upgrade normalize-url to a fixed version for your release line: 4.5.1, 5.3.1 or 6.0.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-33502 being exploited?
There is no known exploitation of CVE-2021-33502 in the wild and no public exploit code.
Sources
Also known as AZL-44850, DEBIAN-CVE-2021-33502, GHSA-px4h-xg32-q955, UBUNTU-CVE-2021-33502.