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Description

UltraVNC Viewer 1.2.4.0 contains a denial of service vulnerability that allows attackers to crash the application by manipulating VNC Server input. Attackers can generate a malformed 256-byte payload and paste it into the VNC Server connection dialog to trigger an application crash.

PUBLISHED Reserved 2026-02-03 | Published 2026-02-05 | Updated 2026-02-05 | Assigner VulnCheck




MEDIUM: 4.6CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Allocation of Resources Without Limits or Throttling

Product status

1.2.4.0
affected

Credits

chuyreds finder

References

www.exploit-db.com/exploits/48291 (ExploitDB-48291) exploit

www.uvnc.com/ (UltraVNC Official Homepage) product

www.vulncheck.com/...avnc-viewer-vncserver-denial-of-service (VulnCheck Advisory: UltraVNC Viewer 1.2.4.0 - 'VNCServer' Denial of Service) third-party-advisory

cve.org (CVE-2020-37134)

nvd.nist.gov (CVE-2020-37134)

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