CVE-2021-43307 Exponential ReDoS in semver-regex
An attacker can cause a denial of service in applications using the semver-regex library by supplying malicious input to the test method.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-43307?
CVE-2021-43307 is a medium-severity denial of service vulnerability in semver-regex, published on 1 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the semver-regex npm package, when an attacker is able to supply arbitrary input to the test() method
Weakness: CWE-1333
Which versions are affected by CVE-2021-43307?
4 open source packages ship an affected version, including semver-regex. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
semver-regex npm | All versions | 3.1.4 |
semver-regex npm | All versions | 3.1.4 |
semver-regex npm | From 4.0.0 | 4.0.3 |
semver-regex npm | From 4.0.0 | 4.0.3 |
Products include Semver-Regex Project Semver-Regex.
How do I fix CVE-2021-43307?
Upgrade semver-regex to a fixed version for your release line: 3.1.4 or 4.0.3.
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-2021-43307 being exploited?
There is no known exploitation of CVE-2021-43307 in the wild and no public exploit code.
Other vulnerabilities in semver-regex
Sources
Also known as GHSA-4x5v-gmq8-25ch, ROOT-APP-NPM-CVE-2021-43307.