HIGH
The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers to cause a denial of service by sending a VTP update with a revision value of 0x7FFFFFFF, which is incremented to 0x80000000 and is interpreted as a negative number in a signed context
Published Sep 14, 2006
7.8
HIGHCVSS 2.0
EPSS 5.05%
Description
The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers to cause a denial of service by sending a VTP update with a revision value of 0x7FFFFFFF, which is incremented to 0x80000000 and is interpreted as a negative number in a signed context.
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.
7.8 HIGH NVD
AV:N/AC:L/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
5.05% 0.05047
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.05047
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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 5.05% (0.05047) | 92.04th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.75% (0.04752) | 90.69th | v5 (v2026.06.15) |
| Oct 8, 2025 | 6.35% (0.06347) | 90.52th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.95% (0.04950) | 88.66th | v4 (v2025.03.14) |
| Mar 29, 2025 | 8.08% (0.08081) | 86.64th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.95% (0.04950) | 88.92th | v4 (v2025.03.14) |
| Dec 17, 2024 | 6.60% (0.06605) | 93.71th | v3 (v2023.03.01) |
| Nov 9, 2023 | 8.07% (0.08069) | 93.64th | v3 (v2023.03.01) |
| Aug 25, 2023 | 7.16% (0.07161) | 93.14th | v3 (v2023.03.01) |
| Jul 18, 2023 | 5.18% (0.05180) | 91.96th | v3 (v2023.03.01) |
| Jun 10, 2023 | 4.17% (0.04170) | 90.96th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.20% (0.04199) | 90.89th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
Weaknesses (1)
References (12)
- http://secunia.com/advisories/21896 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/21902 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://securitytracker.com/id?1016843 vdb-entryx_refsource_SECTRACK
- http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml vendor-advisoryx_refsource_CISCOPatch
- http://www.kb.cert.org/vuls/id/175148 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.osvdb.org/28776 vdb-entryx_refsource_OSVDB
- http://www.phenoelit.de/stuff/CiscoVTP.txt x_refsource_MISC
- http://www.securityfocus.com/archive/1/445896/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/445938/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/19998 vdb-entryx_refsource_BID
- http://www.vupen.com/english/advisories/2006/3600 vdb-entryx_refsource_VUPENVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/28925 vdb-entryx_refsource_XF
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Sep 14, 2006
Updated Aug 7, 2024
Reserved Sep 13, 2006
Link CVE-2006-4775
CISA Vulnrichment
Updated n/a