CVE-2002-1336 Auth bypass in n/a

High 7.5 Published 1 Sep 2004 Updated 8 Aug 2024

Remote attackers can bypass VNC authentication by sniffing reused challenge strings, allowing unauthorized access to the server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2002-1336?

CVE-2002-1336 is a high-severity authentication bypass vulnerability in n/a, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

TightVNC before 1.2.6 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.

Which versions are affected by CVE-2002-1336?

It affects 1 product.

Products include Tightvnc Tightvnc.

How do I fix CVE-2002-1336?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2002-1336 being exploited?

There is no known exploitation of CVE-2002-1336 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2002-1336, GHSA-fcjm-23wr-m9g6.