CVE-2021-3803 Inefficient Regular Expression Complexity in fb55/nth-check
An attacker can cause a denial of service by providing input that triggers inefficient regular expression complexity in the nth-check library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3803?
CVE-2021-3803 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 17 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
nth-check is vulnerable to Inefficient Regular Expression Complexity
Weakness: CWE-1333
Which versions are affected by CVE-2021-3803?
2 open source packages ship an affected version, including nth-check. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
nth-check npm | All versions | 2.0.1 |
nth-check npm | All versions | 2.0.1 |
Products include Debian Debian Linux, Nth-Check Project Nth-Check.
How do I fix CVE-2021-3803?
Upgrade nth-check to 2.0.1 or later.
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-2021-3803 being exploited?
There is no known exploitation of CVE-2021-3803 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as CLSA-2026-1775003168, DEBIAN-CVE-2021-3803, DLA-3428-1, GHSA-rp65-9cf3-cjxr, ROOT-APP-NPM-CVE-2021-3803, UBUNTU-CVE-2021-3803 and 1 more.