CVE-2026-44040: ultravnc through 1.8.2.2 (inclusive); +1 more affected products

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 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes

Component: winvnc, vncviewer
Function: seeds

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Source advisory’s CVSS 3.1 assessment (base score 4.8/10) rates confidentiality and integrity impact as low; availability impact as none. NVD’s CVSS 3.1 assessment (base score 6.5/10) rates confidentiality and integrity impact as low; availability impact as none. The description does not specify what an attacker can achieve beyond these rated impacts.