CVE-2006-2369

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 92.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2006-05-15 · updated 2026-06-16
Weakness: CWE-287

Description

RealVNC 4.1.1, and other products that use RealVNC such as AdderLink IP and Cisco CallManager, allows remote attackers to bypass authentication via a request in which the client specifies an insecure security type such as "Type 1 - None", which is accepted even if it is not offered by the server, as originally demonstrated using a long password.

Affected products

Vnc Realvnc: 4.1.1

References

http://marc.info/?l=full-disclosure&m=114768344111131&w=2
http://marc.info/?l=vnc-list&m=114755444130188&w=2
http://seclists.org/fulldisclosure/2022/May/29
http://secunia.com/advisories/20107
http://secunia.com/advisories/20109
http://secunia.com/advisories/20789
http://securityreason.com/securityalert/8355
http://securitytracker.com/id?1016083
http://www.cisco.com/warp/public/707/cisco-sr-20060622-cmm.shtml
http://www.intelliadmin.com/blog/2006/05/security-flaw-in-realvnc-411.html
http://www.intelliadmin.com/blog/2006/05/vnc-flaw-proof-of-concept.html
http://www.kb.cert.org/vuls/id/117929

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