CVE-2021-43309

CVE-2021-43309 is a medium-severity vulnerability in Litejs Uri-template-lite with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

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

Frequently asked questions

What is CVE-2021-43309?
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
How severe is CVE-2021-43309?
CVE-2021-43309 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-43309 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43309?
CVE-2021-43309 affects Litejs Uri-template-lite. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43309?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43309 published?
CVE-2021-43309 was published on 2022-08-24 and last updated on 2026-06-17.

References

Affected products (1)

Other CWE-1333 vulnerabilities

Browse all CWE-1333 vulnerabilities →