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 92.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
Weaponized
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 92%
  • Public exploit code is available (Metasploit, Exploit-DB, marked verified by Exploit-DB)
CISA-KEV: Not listedEPSS PROB: 92%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified)Exposed services: Not assessed

A fixed version is listed under Patch Availability — apply it.

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
7.5HIGHlow confidence
EG Risk
75
EG Risk 75/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation92% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track or Track* at medium and Track* or Attend at high mission impact.
Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fixed version is listed under Patch Availability. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
92%
EPSS %ILE
99th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track or Track* at medium and Track* or Attend at high mission impact.

A fixed version is listed under Patch Availability. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

May 15, 2006

Last Modified

April 16, 2026

References (27)

15 of 27 shown · show the other 12

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
debian:10vnc4 @ 4.1.1+X4.3.0-10 (fixes >=0)—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 1× in last 7d / 5× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 8 repeat rows among the latest 54 are merged into the row they repeat.

  1. 2026-10-07 23:36 UTCEPSS rescoreEPSS 92% · 99th percentile
  2. 2026-10-01 02:40 UTCOSV refresh
  3. 2026-09-29 02:59 UTCEG score recompute
  4. 2026-09-18 19:20 UTCEPSS rescoreEPSS 92% · 99th percentile
  5. 2026-09-12 05:40 UTCOSV refresh
  6. 2026-09-05 15:21 UTCEPSS rescoreEPSS 92% · 99th percentile
  7. 2026-08-24 11:12 UTCOSV refresh
  8. 2026-08-08 16:30 UTCEPSS rescoreEPSS 91% · 99th percentile
  9. 2026-08-08 07:26 UTCOSV refresh
  10. 2026-08-04 15:03 UTCEPSS rescoreEPSS 91% · 99th percentile
  11. 2026-07-26 13:29 UTCEG score recompute▲ 7.50
  12. 2026-07-24 14:11 UTCEPSS rescoreEPSS 92% · 99th percentile
  13. 2026-07-23 00:50 UTCEG score recompute
  14. 2026-07-23 00:36 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  15. 2026-07-23 00:36 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  16. 2026-07-23 00:34 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  17. 2026-07-23 00:33 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  18. 2026-07-23 00:32 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  19. 2026-07-23 00:30 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  20. 2026-07-23 00:30 UTCEG score recompute▼ 9.00
  21. 2026-07-22 23:54 UTCEG score recompute
  22. 2026-07-22 21:34 UTCEG score recompute
  23. 2026-07-16 16:58 UTCEPSS rescoreEPSS 92% · 99th percentile
  24. 2026-07-09 19:03 UTCEPSS rescoreEPSS 92% · 99th percentile
  25. 2026-07-08 22:09 UTCOSV refresh
Show 21 more
  1. 2026-07-01 15:01 UTCEPSS rescoreEPSS 92% · 99th percentile
  2. 2026-06-25 13:46 UTCEPSS rescoreEPSS 92% · 99th percentile
  3. 2026-06-23 21:29 UTCEPSS rescoreEPSS 92% · 99th percentile
  4. 2026-06-20 10:12 UTCOSV refresh
  5. 2026-06-17 17:49 UTCEPSS rescoreEPSS 92% · 99th percentile
  6. 2026-06-15 17:44 UTCEPSS rescoreEPSS 92% · 99th percentile
  7. 2026-06-12 23:08 UTCEPSS rescoreEPSS 92% · 99th percentile
  8. 2026-06-10 13:17 UTCEPSS rescoreEPSS 92% · 99th percentile
  9. 2026-06-07 15:21 UTCEPSS rescoreEPSS 92% · 99th percentile
  10. 2026-06-05 06:07 UTCEPSS rescoreEPSS 92% · 99th percentile
  11. 2026-06-04 13:09 UTCEPSS rescoreEPSS 92% · 99th percentile
  12. 2026-05-31 08:39 UTCEG score recompute
  13. 2026-05-31 08:39 UTCGHSA enrichmentGHSA-p5jc-gpgq-6vfg · GitHub severity HIGH
  14. 2026-05-29 13:40 UTCEPSS rescoreEPSS 92% · 99th percentile
  15. 2026-05-29 02:06 UTCOSV refresh
  16. 2026-05-28 13:42 UTCEPSS rescoreEPSS 92% · 99th percentile
  17. 2026-05-27 13:37 UTCEPSS rescoreEPSS 92% · 99th percentile
  18. 2026-05-24 16:42 UTCEPSS rescoreEPSS 92% · 99th percentile
  19. 2026-05-22 21:15 UTCEPSS rescoreEPSS 92% · 99th percentile
  20. 2026-05-20 22:36 UTCEPSS rescoreEPSS 92% · 99th percentile
  21. 2026-05-18 21:29 UTCEPSS rescoreEPSS 92% · 99th percentile

Publicly available exploits

(6 references)

Public exploit code is referenced for this CVE (2 Metasploit modules, 4 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-36932✓ verified
    Published May 13, 2012

    RealVNC 4.1.0/4.1.1 - Authentication Bypass

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

    RealVNC - Authentication Bypass (Metasploit)

    Open source ↗
  • Metasploitauxiliary/admin/vnc/realvnc_41_bypass✓ verified
    Published Aug 26, 2011

    RealVNC NULL Authentication Mode Bypass

    Open source ↗
  • Metasploitauxiliary/scanner/vnc/vnc_none_auth✓ verified
    Published Jun 6, 2008

    VNC Authentication None Detection

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

    RealVNC 4.1.0 < 4.1.1 - VNC Null Authentication Bypass

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

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

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2006-2369?
CVE-2006-2369 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2006-2369 was made public on May 8, 2006: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on May 15, 2006. EchelonGraph's copy of the record carries a last-modified date of April 16, 2026; the record at its source may have been updated since.
Is CVE-2006-2369 actively exploited?
CVE-2006-2369 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model places it in Tier 2 (Weaponized), which is not evidence of exploitation: a Metasploit module exists for it, and Exploit-DB marks a public exploit for it as verified. EchelonGraph does not test whether exploit code works. FIRST EPSS estimates a 92% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2006-2369?
A fixed version for CVE-2006-2369 is listed under Patch Availability on this page: update to the version listed for your package.

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