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.
02 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.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 2.40% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 83.6% of scored records. A rank, not a probability.
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-16.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2004-09-01 04:00Z22 YR AGO
- Last updated
- 2024-08-08 03:19Z2 YR AGO
- Reserved
- 2002-12-02
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- No CWE assigned
- Data version
- 5.1
- Document digest
- 270c044d3794bb1e88fb3fbae8daf40b724aa40b2ac5c33063e3fc4d7873c766
05 Affected products
06 References
- exchange.xforce.ibmcloud.comvnc-weak-authentication(5992)https://exchange.xforce.ibmcloud.com/vulnerabilities/5992
- www.redhat.comRHSA-2002:287http://www.redhat.com/support/errata/RHSA-2002-287.html
- marc.info20020724 VNC authentication weaknesshttp://marc.info/?l=bugtraq&m=102753170201524&w=2
- www.redhat.comRHSA-2003:041http://www.redhat.com/support/errata/RHSA-2003-041.html
- www.mandrakesoft.comMDKSA-2003:022http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:022
- distro.conectiva.com.brCLA-2003:640http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000640
- www.tightvnc.comhttp://www.tightvnc.com/WhatsNew.txt
- marc.info20020726 RE: VNC authentication weaknesshttp://marc.info/?l=bugtraq&m=102769183913594&w=2
- www.securityfocus.com5296http://www.securityfocus.com/bid/5296
07 Fixed in
Debian 12
- tightvnc Fixed in 1.2.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- tightvnc Fixed in 1.2.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- tightvnc Fixed in 1.2.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.