HIGH
WinVNC 3.3.3 and earlier generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authentication by sniffing the challenge and response of other users
Published Mar 20, 2005
7.5
HIGHCVSS 2.0
EPSS 2.06%
Description
WinVNC 3.3.3 and earlier generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authentication by sniffing the challenge and response of other users.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.06% 0.02064
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02064
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.06% (0.02064) | 80.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.06% (0.02064) | 78.81th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.03% (0.01028) | 75.77th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.62% (0.00616) | 79.48th | v3 (v2023.03.01) |
| Feb 25, 2024 | 0.62% (0.00616) | 78.19th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.67% (0.00666) | 79.05th | v3 (v2023.03.01) |
| Jul 10, 2023 | 0.67% (0.00666) | 76.94th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.94% (0.00942) | 80.71th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (4)
- http://www.kb.cert.org/vuls/id/303080 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- http://www.securityfocus.com/bid/2275 vdb-entryx_refsource_BIDVendor Advisory
- http://www1.corest.com/common/showdoc.php?idxseccion=10&idx=117 x_refsource_MISCVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/5992 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://www.kb.cert.org/vuls/id/303080 | third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource | |
| http://www.securityfocus.com/bid/2275 | vdb-entryx_refsource_BIDVendor Advisory | |
| http://www1.corest.com/common/showdoc.php?idxseccion=10&idx=117 | x_refsource_MISCVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/5992 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Mar 20, 2005
Updated Aug 8, 2024
Reserved Mar 20, 2005
Link CVE-2001-1422
CISA Vulnrichment
Updated n/a