Skip to content
Fencer Vulns
critical 10.0

CVE-2009-0388 in the critical feed json

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 ser…

published 2009-02-04 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0392

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.3%
EPSS 13.3% chance of exploitation in 30 days, percentile 96%
public exploits
2
Exploit-DB

Summary

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.

Patch / fix

Timeline

  1. First public exploit (EDB-7990)
  2. Published

Exploit prediction

13.33% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-8024 TightVNC - Authentication Failure Integer Overflow (PoC) dos, 2009-02-09
  • EDB-7990 UltraVNC/TightVNC (Multiple VNC Clients) - Multiple Integer Overflows (PoC) dos, 2009-02-04
  • securityfocus.com http://www.securityfocus.com/bid/33568 referenced PoC, tagged "exploit" by a source, unverified
  • coresecurity.com http://www.coresecurity.com/content/vnc-integer-overflows referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.