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Vulnerability record · CVE-2009-0388 · published 4 February 2009

CVE-2009-0388: Tightvnc vulnerability

Tightvnc · Tightvnc

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.

10.0 CVSS 2.0 High EPSS 13% · top 3.7% CWE-189 · CWE-189
10.0CVSS 2.0 base score
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
20References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 Exploit
http://www.securityfocus.com/archive/1/500632/100/0/threaded
http://www.securityfocus.com/bid/33568 ExploitPatch
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 Exploit
http://www.securityfocus.com/archive/1/500632/100/0/threaded
http://www.securityfocus.com/bid/33568 ExploitPatch
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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2006-2206Ultravnc vulnerabilityThe MS-Logon authentication scheme in UltraVNC (aka Ultr@VNC) 1.0.1 uses weak encryption (XOR) for challenge/response, which allows remote attackers …EPSS 2.1%9.8CVE-2021-42785Tightvnc classic buffer overflow vulnerabilityBuffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted Framebuffe…EPSS 2.3%9.8CVE-2019-8287Tightvnc classic buffer overflow vulnerabilityTightVNC code version 1.3.10 contains global buffer overflow in HandleCoRREBBP macro function, which can potentially result code execution. This atta…EPSS 19%9.8CVE-2019-15678Tightvnc heap-based buffer overflow vulnerabilityTightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result code execution.. This attack app…EPSS 12%9.8CVE-2019-15679Tightvnc heap-based buffer overflow vulnerabilityTightVNC code version 1.3.10 contains heap buffer overflow in InitialiseRFBConnection function, which can potentially result code execution. This att…EPSS 12%9.3CVE-2008-5001Ultravnc memory buffer overflow vulnerabilityMultiple stack-based buffer overflows in multiple functions in vncviewer/FileTransfer.cpp in vncviewer for UltraVNC 1.0.2 and 1.0.4 before 01252008, …EPSS 5.6%9.3CVE-2008-0610Ultravnc memory buffer overflow vulnerabilityStack-based buffer overflow in the ClientConnection::NegotiateProtocolVersion function in vncviewer/ClientConnection.cpp in vncviewer for UltraVNC 1.…EPSS 39%9.0CVE-2023-27830Tightvnc improper privilege management vulnerabilityTightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when e…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2009-0388), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.