onyx

onyx --cves cve-2021-32780

CVE-2021-32780

HIGHEnvoy Proxy
score
<0.1
cvss
8.6
epss
1.2%
published
2021-08-24
kev added
—
first seen

Envoy versions 1.19.1, 1.18.4 contain a denial of service caused by improper handling of GOAWAY and SETTINGS_MAX_CONCURRENT_STREAMS frames in HTTP/2, letting untrusted upstream servers cause Envoy process termination, exploit requires untrusted upstream server to send specific frame sequences.

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 1.2%2026-09-23: epss 1.2%2026-09-24: epss 1.2%2026-09-25: epss 1.2%2026-09-26: epss 1.2%2026-09-27: epss 1.2%2026-09-28: epss 1.2%2026-09-29: epss 1.2%2026-09-30: epss 1.2%2026-10-01: epss 1.2%2026-10-02: epss 1.2%2026-10-03: epss 1.2%2026-10-04: epss 1.2%2026-10-05: epss 1.2%2026-10-06: epss 1.2%2026-10-07: epss 1.2%2026-10-08: epss 1.2%2026-10-09: epss 1.2%2026-10-10: epss 1.2%2026-10-11: epss 1.2%2026-10-12: epss 1.2%2026-10-13: epss 1.2%2026-10-14: epss 1.2%2026-10-15: epss 1.2%2026-10-16: epss 1.2%2026-10-18: epss 1.2%2026-10-19: epss 1.2%2026-10-20: epss 1.2%2026-10-21: epss 1.2%1.2%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx

Weaknesses

CWE-754

References 2