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CVE-2002-1336
TightVNC before 1.2.6 generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC…
High7.5EPSS 2.4%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 2.4% · top 16% of all CVEs (2 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- n/a
Affected products
n/a
- affected n/a
References (9)
- vnc-weak-authentication(5992) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- RHSA-2002:287 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 20020724 VNC authentication weakness (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- RHSA-2003:041 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- MDKSA-2003:022 (opens in a new tab)vendor-advisoryx_refsource_MANDRAKEx_transferred
- CLA-2003:640 (opens in a new tab)vendor-advisoryx_refsource_CONECTIVAx_transferred
- http://www.tightvnc.com/WhatsNew.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20020726 RE: VNC authentication weakness (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 5296 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Record last updated .