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Fencer Vulns
critical 9.0

CVE-2006-1652 in the critical feed json

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 attack…

published 2006-04-06 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-1653

cvss
9.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
68.0%
EPSS 68.0% chance of exploitation in 30 days, percentile 99.3%
public exploits
4
Metasploit, Exploit-DB

Summary

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.

Timeline

  1. First public exploit (Metasploit exploit/windows/vnc/ultravnc_client)
  2. Published

Exploit prediction

68.04% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/windows/vnc/ultravnc_client UltraVNC 1.0.1 Client Buffer Overflow metasploit exploit, normal rank, 2006-04-04
  • EDB-27569 UltraVNC 1.0.1 - Multiple Remote Error Logging Buffer Overflow Vulnerabilities (2) remote, 2006-04-04
  • EDB-27568 UltraVNC 1.0.1 - Multiple Remote Error Logging Buffer Overflow Vulnerabilities (1) remote, 2006-04-04
  • EDB-16490 UltraVNC 1.0.1 - Client Buffer Overflow (Metasploit) remote, 2010-04-30
  • exploit-db.com https://www.exploit-db.com/exploits/1642 referenced PoC, tagged "exploit" by a source, unverified
  • exploit-db.com https://www.exploit-db.com/exploits/1643 referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/bid/17378 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Classification

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

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.