Which products and versions are affected by CVE-2006-1652?

Affected: Tabbed Viewer (Ultravnc) versions 1.29; Vnc Viewer (Ultravnc) versions 1.0.1. The full list is in the CVE brief.

Is CVE-2006-1652 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2006-1652 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2006-1652?

Public exploit code is available.

Is there a fix for CVE-2006-1652?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2006-1652 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2006-1652

CriticalPublic exploit

Published Apr 6, 2006 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2006-1652 is a critical-severity vulnerability (CVSS 9.0 v2) affecting Tabbed Viewer (Ultravnc), Vnc Viewer (Ultravnc).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 68% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

9.0

AV:N/AC:L/Au:S/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

68%

Higher than 99.3% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2006-1652 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Multiple buffer overflows in (a) UltraVNC (aka Ultr@VNC) 1.0.1 and earlier and (b) tabbed_viewer 1.29 (1) allow user-assisted remote attackers to execute arbitrary code via a malicious server that sends a long string to a client that connects on TCP port 5900, which triggers an overflow in Log::ReallyPrint; and (2) allow remote attackers to cause a denial of service (server crash) via a long HTTP GET request to TCP port 5800, which triggers an overflow in VNCLog::ReallyPrint.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Tabbed ViewerUltravnc	1.29	n/a
Vnc ViewerUltravnc	1.0.1	n/a

Timeline

Publicly disclosed
Apr 6, 2006
Last updated
Apr 15, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

11 more references in the full CVE brief

FAQ

Common Questions.

Multiple buffer overflows in (a) UltraVNC (aka Ultr@VNC) 1.0.1 and earlier and (b) tabbed_viewer 1.29 (1) allow user-assisted remote attackers to execute arbitrary code via a malicious server that sends a long string to a client that connects on TCP port 5900, which triggers an overflow in Log::ReallyPrint; and (2) al…
Affected: Tabbed Viewer (Ultravnc) versions 1.29; Vnc Viewer (Ultravnc) versions 1.0.1. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2006-1652 Running On Your Attack Surface?

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