Cyber Resilience

CVE-2021-43307

MediumPublic PoC

Published: 02 June 2022

Published
02 June 2022
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0059 69.5th percentile
Risk Priority 12 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-43307 is a medium-severity Inefficient Regular Expression Complexity (CWE-1333) vulnerability in Semver-Regex Project Semver-Regex. Its CVSS base score is 5.9 (Medium).

Operationally, ranked in the top 30.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-1333

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

semver-regex project
semver-regex
≤ 3.1.4 · 4.0.0 — 4.0.3

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References