onyx

onyx --cves cve-2021-32777

CVE-2021-32777

HIGHEnvoy Proxy
score
<0.1
cvss
8.6
epss
3.3%
published
2021-08-24
kev added
—
first seen

Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain a header merging issue in ext-authz caused by only sending the last header value, letting attackers bypass authorization, exploit requires crafted requests with multiple header values.

Timeline

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

events2021-08-24 — PublishedP2026-10-21 — Tracked by OnyxTscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 3.3%2026-09-23: epss 3.3%2026-09-24: epss 3.3%2026-09-25: epss 3.3%2026-09-26: epss 3.3%2026-09-27: epss 3.3%2026-09-28: epss 3.3%2026-09-29: epss 3.3%2026-09-30: epss 3.3%2026-10-01: epss 3.3%2026-10-02: epss 3.3%2026-10-03: epss 3.3%2026-10-04: epss 3.3%2026-10-05: epss 3.3%2026-10-06: epss 3.3%2026-10-07: epss 3.3%2026-10-08: epss 3.3%2026-10-09: epss 3.3%2026-10-10: epss 3.3%2026-10-11: epss 3.3%2026-10-12: epss 3.3%2026-10-13: epss 3.3%2026-10-14: epss 3.3%2026-10-15: epss 3.3%2026-10-16: epss 3.3%2026-10-18: epss 3.3%2026-10-19: epss 3.3%2026-10-20: epss 3.3%2026-10-21: epss 3.3%3.3%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx

Weaknesses

CWE-551 CWE-863

References 2