CVE-2001-1422

HIGH 7.5CVE-2001-1422 · Published 23/01/2001 · updated 16/06/2026

In short

CVE-2001-1422 is a HIGH (CVSS 7.5) vulnerability affecting winvnc (att).
Chance of exploitation in the next 30 days (EPSS): 2.1%, higher than 81.4% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
winvnc att	`≤ 3.3.3`	No fix yet

Description

WinVNC 3.3.3 and earlier generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authentication by sniffing the challenge and response of other users.

References

kb.cert.org/vuls/id/303080 · Third Party Advisory
securityfocus.com/bid/2275 · Vendor Advisory
www1.corest.com/common/showdoc.php · Vendor Advisory
exchange.xforce.ibmcloud.com/vulnerabilities/5992

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