onyx

onyx --cves cve-2020-12783

CVE-2020-12783

HIGHPOCExim
score
<0.1
cvss
7.5
epss
4.6%
published
2020-05-11
kev added
—
first seen

Exim through 4.93 contains an out-of-bounds read caused by the SPA authenticator in auths/spa.c and auths/auth-spa.c, letting attackers bypass SPA/NTLM authentication, exploit requires sending crafted authentication requests.

Timeline

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

events2020-05-11 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 4.6%2026-09-23: epss 4.6%2026-09-24: epss 4.6%2026-09-25: epss 4.6%2026-09-26: epss 4.6%2026-09-27: epss 4.6%2026-09-28: epss 4.6%2026-09-29: epss 4.6%2026-09-30: epss 4.6%2026-10-01: epss 4.6%2026-10-02: epss 4.6%2026-10-03: epss 4.6%2026-10-04: epss 4.6%2026-10-05: epss 4.6%2026-10-06: epss 4.6%2026-10-07: epss 4.6%2026-10-08: epss 4.6%2026-10-09: epss 4.6%2026-10-10: epss 4.6%2026-10-11: epss 4.6%2026-10-12: epss 4.6%2026-10-13: epss 4.6%2026-10-14: epss 4.6%2026-10-15: epss 4.6%2026-10-16: epss 4.6%2026-10-18: epss 4.6%2026-10-19: epss 4.6%2026-10-20: epss 4.6%2026-10-21: epss 4.6%4.6%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-125

References 9