onyx

onyx --cves cve-2019-18277

CVE-2019-18277

HIGHPOCHAProxy
score
<0.1
cvss
7.5
epss
10.1%
published
2019-10-23
kev added
—
first seen

HAProxy before 2.0.6 contains a message handling flaw in legacy mode caused by missing 'chunked' value in transfer-encoding header, letting attackers potentially craft HTTP request smuggling attacks when combined with 'http-reuse always' setting, exploit requires specific header manipulation.

Timeline

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

events2019-10-23 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 10.0%2026-09-23: epss 10.0%2026-09-24: epss 10.0%2026-09-25: epss 10.0%2026-09-26: epss 10.0%2026-09-27: epss 10.0%2026-09-28: epss 10.0%2026-09-29: epss 10.0%2026-09-30: epss 10.0%2026-10-01: epss 10.0%2026-10-02: epss 10.1%2026-10-03: epss 10.1%2026-10-04: epss 10.1%2026-10-05: epss 10.1%2026-10-06: epss 10.1%2026-10-07: epss 10.1%2026-10-08: epss 10.1%2026-10-09: epss 10.1%2026-10-10: epss 10.1%2026-10-11: epss 10.1%2026-10-12: epss 10.1%2026-10-13: epss 10.1%2026-10-14: epss 10.1%2026-10-15: epss 10.1%2026-10-16: epss 10.1%2026-10-18: epss 10.1%2026-10-19: epss 10.1%2026-10-20: epss 10.1%2026-10-21: epss 10.1%10.1%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-444

References 7