How severe is CVE-2001-1422?

CVE-2001-1422 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-1422 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1422?

CVE-2001-1422 affects Att Winvnc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1422?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2001-1422 published?

CVE-2001-1422 was published on 2001-01-23 and last updated on 2026-06-16.

CVE-2001-1422

CVE-2001-1422 is a high-severity vulnerability in Att Winvnc with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Att Winvnc
Published: 2001-01-23
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2001-1422?: 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.
How severe is CVE-2001-1422?: CVE-2001-1422 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-1422 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1422?: CVE-2001-1422 affects Att Winvnc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1422?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-1422 published?: CVE-2001-1422 was published on 2001-01-23 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:att:winvnc:*:*:*:*:*:*:*:*

More vulnerabilities in Att Winvnc

CVE-2001-0168 — Critical (CVSS 10.0): Buffer overflow in AT&T WinVNC (Virtual Network Computing) server 3.3.3r7 and earlier allows remote attackers to…
CVE-2000-1164 — Critical (CVSS 9.0): WinVNC installs the WinVNC3 registry key with permissions that give Special Access (read and modify) to the Everybody…
CVE-2001-0167 — High (CVSS 7.6): Buffer overflow in AT&T WinVNC (Virtual Network Computing) client 3.3.3r7 and earlier allows remote attackers to…

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