CVE-2021-43309 ReDoS in uri-template-lite URI.expand function
An attacker can cause a denial of service by supplying malicious input to the URI.expand function in the uri-template-lite 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-2021-43309?
CVE-2021-43309 is a medium-severity denial of service vulnerability in uri-template-lite, published on 24 Aug 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 uri-template-lite npm package, when an attacker is able to supply arbitrary input to the "URI.expand" method
Weakness: CWE-1333
Which versions are affected by CVE-2021-43309?
2 open source packages ship an affected version, including uri-template-lite. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
uri-template-lite npm | All versions | 22.9.0 |
uri-template-lite npm | All versions | 22.9.0 |
Products include Litejs Uri-Template-Lite.
How do I fix CVE-2021-43309?
Upgrade uri-template-lite to 22.9.0 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-2021-43309 being exploited?
There is no known exploitation of CVE-2021-43309 in the wild and no public exploit code.
Sources
Also known as GHSA-chw2-6c7r-37p7.