CVE-2006-2369

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 91.5% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Trending — 3 sources updated this weekWeaponized
7.5EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 92%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 92%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5(low)
EG Risk
75(Track)
EG Risk 75/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation92% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
92%
EPSS %ILE
100%
KEV
Not listed

Published

May 15, 2006

Last Modified

April 16, 2026

References (53)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
debian:10vnc4 @ 4.1.1+X4.3.0-10—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 13:29 UTCEG score recompute▲ 7.50
  2. 2026-07-24 14:11 UTCEPSS rescore
  3. 2026-07-23 00:50 UTCEG score recompute
  4. 2026-07-23 00:36 UTCGHSA enrichment
  5. 2026-07-23 00:36 UTCGHSA enrichment
  6. 2026-07-23 00:34 UTCGHSA enrichment
  7. 2026-07-23 00:33 UTCGHSA enrichment
  8. 2026-07-23 00:32 UTCGHSA enrichment
  9. 2026-07-23 00:30 UTCGHSA enrichment
  10. 2026-07-23 00:30 UTCEG score recompute▼ 9.00
  11. 2026-07-22 23:54 UTCEG score recompute
  12. 2026-07-22 21:34 UTCEG score recompute
  13. 2026-07-16 16:58 UTCEPSS rescore
  14. 2026-07-09 19:03 UTCEPSS rescore
  15. 2026-07-08 22:09 UTCOSV refresh
  16. 2026-07-01 15:01 UTCEPSS rescore
  17. 2026-06-25 13:46 UTCEPSS rescore
  18. 2026-06-23 21:29 UTCEPSS rescore
  19. 2026-06-23 21:29 UTCEPSS rescore
  20. 2026-06-20 10:12 UTCOSV refresh
  21. 2026-06-17 17:49 UTCEPSS rescore
  22. 2026-06-17 17:49 UTCEPSS rescore
  23. 2026-06-15 17:44 UTCEPSS rescore
  24. 2026-06-12 23:08 UTCEPSS rescore
  25. 2026-06-10 13:17 UTCEPSS rescore
Show 19 more
  1. 2026-06-07 15:21 UTCEPSS rescore
  2. 2026-06-05 06:07 UTCEPSS rescore
  3. 2026-06-05 06:07 UTCEPSS rescore
  4. 2026-06-04 13:09 UTCEPSS rescore
  5. 2026-06-04 13:09 UTCEPSS rescore
  6. 2026-05-31 08:39 UTCEG score recompute
  7. 2026-05-31 08:39 UTCGHSA enrichment
  8. 2026-05-29 13:40 UTCEPSS rescore
  9. 2026-05-29 02:06 UTCOSV refresh
  10. 2026-05-28 13:42 UTCEPSS rescore
  11. 2026-05-28 13:42 UTCEPSS rescore
  12. 2026-05-27 13:37 UTCEPSS rescore
  13. 2026-05-27 13:37 UTCEPSS rescore
  14. 2026-05-24 16:42 UTCEPSS rescore
  15. 2026-05-22 21:15 UTCEPSS rescore
  16. 2026-05-22 21:15 UTCEPSS rescore
  17. 2026-05-20 22:36 UTCEPSS rescore
  18. 2026-05-20 22:36 UTCEPSS rescore
  19. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(6 references)

Working exploit code is in the public domain (2 Metasploit modules) (4 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-36932✓ verified
    First seen May 13, 2012

    RealVNC 4.1.0/4.1.1 - Authentication Bypass

    Open source ↗
  • Exploit-DBEDB-17719✓ verified
    First seen Aug 26, 2011

    RealVNC - Authentication Bypass (Metasploit)

    Open source ↗
  • Exploit-DBEDB-1791✓ verified
    First seen May 16, 2006

    RealVNC 4.1.0 < 4.1.1 - VNC Null Authentication Bypass

    Open source ↗
  • Exploit-DBEDB-1794✓ verified
    First seen May 15, 2006

    RealVNC 4.1.0 < 4.1.1 - VNC Null Authentication Bypass (Metasploit)

    Open source ↗
  • Metasploitauxiliary/admin/vnc/realvnc_41_bypass✓ verified
    First seen May 15, 2006

    RealVNC NULL Authentication Mode Bypass

    Open source ↗
  • Metasploitauxiliary/scanner/vnc/vnc_none_auth✓ verified
    First seen Jan 1, 2006

    VNC Authentication None Detection

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(4)

What is CVE-2006-2369?
CVE-2006-2369 is a high vulnerability published on May 15, 2006. 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,…
When was CVE-2006-2369 disclosed?
CVE-2006-2369 was first published in the National Vulnerability Database on May 15, 2006, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2006-2369 actively exploited?
CVE-2006-2369 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92% probability of exploitation in the next 30 days, which ranks it in the top 0.2% of all scored CVEs.
How do I remediate CVE-2006-2369?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2006-2369, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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