CVE-2002-1336

CVE-2002-1336 is a high-severity vulnerability in Tightvnc 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

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.

Frequently asked questions

What is CVE-2002-1336?
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.
How severe is CVE-2002-1336?
CVE-2002-1336 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2002-1336 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-1336?
CVE-2002-1336 primarily affects Tightvnc. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-1336?
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-2002-1336 published?
CVE-2002-1336 was published on 2002-12-11 and last updated on 2026-06-16.

References

Affected products (5)

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