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No exploitation reportedFix available

CVE-2021-43307

No exploitation reported by the sources we read.

  • Published2022-06-02
  • Fixed in4.0.3 · 3.1.4
  • WeaknessCWE-1333

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC
  1. 2022-06-0214:15CVE publishedNVD

Versions per branch

NVD · OSV
Semver-regex project semver-regex
BranchAffectedFixed in
4.0≥ 4.0.0, < 4.0.34.0.3
3.1< 3.1.43.1.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/semver-regexRoot:npmall versions · fixed in 2.0.0-root.io.2
  • pgadmin4Chainguardall versions · fixed in 9.1-r1and 1 other package
  • py3.10-captumChainguardall versions · fixed in 0.9.0-r1and 3 other packages
  • semver-regexTuxCare:npmfrom 2.0.0-tuxcare.0 · fixed in 2.0.0-tuxcare.1
  • semver-regexRoot:npmall versions · fixed in 2.0.0-aikido.2

Full record on NVD

Fix

  1. Update Semver-regex project semver-regex to 4.0.3 · 3.1.4

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.15.9known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-1333known since 2026-10-23
  • NVDweakness (CWE)CWE-1333read 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryLOW2022-06-03

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-06-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4x5v-gmq8-25ch

Frequently asked questions

What is CVE-2021-43307?

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

Is CVE-2021-43307 actively exploited?

Active exploitation of CVE-2021-43307 has not been confirmed. Its EPSS score was 1.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-43307?

CVE-2021-43307 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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