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.
Conclusion & alert: CVE-2006-2369 is rated High Exploit Risk (79.7/100): CVSS High severity, with high exploitation likelihood (EPSS 92.34%, 100th percentile). Core evidence: 7 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 36932 | exploit_db | edb | 2012-05-13 | Exploit-DB ↗ |
| 17719 | exploit_db | edb | 2011-08-26 | Exploit-DB ↗ |
| 1791 | exploit_db | edb | 2006-05-16 | Exploit-DB ↗ |
| 1794 | exploit_db | edb | 2006-05-15 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-24 | 92.50% | 92.34% | -0.16% |
| 2 | 2026-03-21 | 91.14% | 92.50% | +1.35% |
| 3 | 2026-01-27 | — | 91.14% | — |
Full EPSS history (20 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2006-2369 |
ubuntu
|
medium | CVE-2006-2369 medium priority: Ubuntu including 1 source packages (vnc4), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. | https://ubuntu.com/security/CVE-2006-2369 |
This issue only affected version 4.1.1 and not the versions distributed with Red Hat Enterprise Linux 2.1, 3, or 4.