CVE-2026-7840: ultravnc through 1.8.2.2 (inclusive); +1 more affected products

CVE-2026-7840. CVSS 3.1 base score 9.8 (CRITICAL, Source advisory). EPSS 0.02628 (percentile 0.85403), scored 24-Oct-2026.

Affected technology

ultravnc · through 1.8.2.2 (inclusive)
uvnc

UltraVNC · 0 through 1.8.2.2
uvnc

Description’s affected range: through 1.8.2.2

Component: repeater

Attack conditions (Source advisory, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Unauthenticated attacker can achieve arbitrary code execution on the host running the repeater. Source advisory’s CVSS 4.0 assessment (base score 9.3/10) rates confidentiality, integrity and availability impact as high.

Published 25-Oct-2026 19:51 UTC

CWE: CWE-787
CCR priority: 39.9 /100 (P4)
CVSS 3.1: 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · Source advisory
EPSS: 0.02628 · percentile 0.85381 · 2026-10-25
KEV: no

Provenance

FIRST EPSS daily exploit-probability · Source record · observed 2026-10-25 19:52:47.952465+00:00 UTC
NVD CVE API 2.0 · Source record · observed 2026-10-25 19:51:06.643138+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-7840.html