CVE-2001-0167
HighPublic exploitBuffer overflow in AT&T WinVNC (Virtual Network Computing) client 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long rfbConnFailed packet with a long reason string.
Published May 3, 2001 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-2001-0167 is a high-severity vulnerability (CVSS 7.6 v2) affecting Winvnc (Att).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 51% probability of exploitation in the next 30 days.
- Fixed versions are available, including Winvnc 3.3.3r7.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
7.6
AV:N/AC:H/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
51%
Higher than 98.9% 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-2001-0167 brief as a PDF
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Description
Buffer overflow in AT&T WinVNC (Virtual Network Computing) client 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long rfbConnFailed packet with a long reason string.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WinvncAtt | See advisory | 3.3.3r7 |
Patched Releases
Winvnc
3.3.3r7
Timeline
Publicly disclosed
May 3, 2001
Last updated
Apr 15, 2026
References
FAQ
Common Questions.
Buffer overflow in AT&T WinVNC (Virtual Network Computing) client 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long rfbConnFailed packet with a long reason string.
Affected: Winvnc (Att). 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.
Fixed versions are available, including Winvnc 3.3.3r7.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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