Winvnc vulnerabilitiesRanked by how likely they are to be used.

Product2 versions
The short answer

Winvnc is made by Att. We track 4 published vulnerabilities listed under that exact name, across 2 versions. None of them is on the list of flaws known to be exploited today. Att lists newer releases under their own names, such as Winvnc Server, so check those pages too.

See the riskiest flaws

We keep watching the known-exploited list.

Other names

Is Winvnc listed under other names? Yes.

Att also lists Winvnc under more specific names, such as Winvnc Server. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.

Known exploited

Which Winvnc vulnerabilities are being exploited?

This is the list that matters most: flaws criminals are using now.

None of Winvnc's published vulnerabilities is on the list of flaws known to be exploited today. We keep watching that list.

Exploit likelihood

Which Winvnc flaws are most likely to be used?

Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.

50% or more10% to 49%Under 10%
  1. 71%

    Buffer overflow in AT&T WinVNC (Virtual Network Computing) server 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long HTTP GET request when the DebugLevel registry key is greater than 0.

    CVSS10.0Published3 May 2001
  2. 51%

    Buffer overflow in AT&T WinVNC (Virtual Network Computing) client 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long rfbConnFailed packet with a long reason string.

    CVSS7.6Published3 May 2001
  3. 2.1%

    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.

    CVSS7.5Published23 Jan 2001
  4. 1.5%

    WinVNC installs the WinVNC3 registry key with permissions that give Special Access (read and modify) to the Everybody group, which allows users to read and modify sensitive information such as passwords and gain...

    CVSS9.0Published9 Jan 2001
Precursor Intelligence

Running Winvnc? We'll keep checking.

Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.

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FAQ

Common questions, answered plainly.

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We track 4 published vulnerabilities listed under the name Winvnc, across 2 versions.

None of Winvnc's vulnerabilities is on the list of flaws known to be exploited today.

Att also lists Winvnc under more specific names, such as Winvnc Server. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.

Create a Precursor Intelligence account and track Winvnc. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.