CVE-2022-21222 Regular Expression Denial of Service (ReDoS)
An attacker can cause a denial of service in applications using the css-what library by triggering a regular expression denial of service via the parse function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-21222?
CVE-2022-21222 is a medium-severity denial of service vulnerability in css-what, published on 30 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.
Weakness: CWE-1333
Which versions are affected by CVE-2022-21222?
2 open source packages ship an affected version, including css-what. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
css-what npm | All versions | 2.1.3 |
css-what npm | All versions | 2.1.3 |
Products include Css-What Project Css-What.
How do I fix CVE-2022-21222?
Upgrade css-what to 2.1.3 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-2022-21222 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-21222 exists.
Other vulnerabilities in css-what
Sources
Also known as DEBIAN-CVE-2022-21222, GHSA-p28h-cc7q-c4fg, UBUNTU-CVE-2022-21222.