onyx

onyx --cves cve-2021-3672

CVE-2021-3672

MEDPOCNode.js
score
<0.1
cvss
5.6
epss
2.8%
published
2021-11-23
kev added
—
first seen

c-ares library contains a missing input validation check of host names returned by DNS, letting malicious DNS responses produce incorrect hostnames, exploit requires attacker to control DNS responses.

Timeline

How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.

events2021-11-23 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 2.8%2026-09-23: epss 2.8%2026-09-24: epss 2.8%2026-09-25: epss 2.8%2026-09-26: epss 2.8%2026-09-27: epss 2.8%2026-09-28: epss 2.8%2026-09-29: epss 2.8%2026-09-30: epss 2.8%2026-10-01: epss 2.8%2026-10-02: epss 2.8%2026-10-03: epss 2.8%2026-10-04: epss 2.8%2026-10-05: epss 2.8%2026-10-06: epss 2.8%2026-10-07: epss 2.8%2026-10-08: epss 2.8%2026-10-09: epss 2.8%2026-10-10: epss 2.8%2026-10-11: epss 2.8%2026-10-12: epss 2.8%2026-10-13: epss 2.8%2026-10-14: epss 2.8%2026-10-15: epss 2.8%2026-10-16: epss 2.8%2026-10-18: epss 2.8%2026-10-19: epss 2.8%2026-10-20: epss 2.8%2026-10-21: epss 2.8%2.8%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx
  3. Public PoC

Exploit availability

Public PoC flagged by vulnx; no direct exploit link among the citations.

Weaknesses

CWE-79

References 5