Vulnerability Report

CVE-2009-0388

Title: Ultravnc RCE

DoS

Proof Of Concept

PoC Available for CVE-2009-0388

CWE Category CWE-189

Published Date Feb 04, 2009

Modified Date Jun 16, 2026

Exploit Status Available

Score 10.0 CVSS v2.0

Exploit Probability (EPSS)

13.33%

Vulnerability Summary

CVE-2009-0388: Multiple integer signedness errors in (1) UltraVNC 1.0.2 and 1.0.5 and (2) TightVnc 1.3.9 allow remote VNC servers to cause a denial of service (heap corruption and application crash) or possibly execute arbitrary code via a large length value in a message, related to the (a) ClientConnection::CheckBufferSize and (b) ClientConnection::CheckFileZipBufferSize functions in ClientConnection.cpp.

Impacted Vendors

tightvnc 1

ultravnc 1

uvnc 1

Reference Links

http://forum.ultravnc.info/viewtopic.php?t=14654 http://secunia.com/advisories/33807 http://vnc-tight.svn.sourceforge.net/viewvc/vnc-tight?view=rev&revision=3564 http://www.coresecurity.com/content/vnc-integer-overflows http://www.securityfocus.com/archive/1/500632/100/0/threaded http://www.securityfocus.com/bid/33568 http://www.vupen.com/english/advisories/2009/0321 http://www.vupen.com/english/advisories/2009/0322 https://www.exploit-db.com/exploits/7990 https://www.exploit-db.com/exploits/8024 http://forum.ultravnc.info/viewtopic.php?t=14654 http://secunia.com/advisories/33807 http://vnc-tight.svn.sourceforge.net/viewvc/vnc-tight?view=rev&revision=3564 http://www.coresecurity.com/content/vnc-integer-overflows http://www.securityfocus.com/archive/1/500632/100/0/threaded http://www.securityfocus.com/bid/33568 http://www.vupen.com/english/advisories/2009/0321 http://www.vupen.com/english/advisories/2009/0322 https://www.exploit-db.com/exploits/7990 https://www.exploit-db.com/exploits/8024

CVSS v2.0

Source Entity [email protected]

Severity HIGH

10.0

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:L/Au:N/C:C/I:C/A:C

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2009-0388 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/8024

View Code

Exploit-DB https://www.exploit-db.com/exploits/7990

View Code

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 09, 2025 MODIFIED

Vulnerability data or affected products updated.

February 04, 2009 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.