Nortel Contivity VPN Client 2.1.7, 3.00, 3.01, 4.91, and 5.01, when opening a VPN tunnel, does not check the gateway certificate until after a dialog box has been displayed to the user, which creates a race condition that allows remote attackers to perform a man-in-the-middle (MITM) attack
Published Dec 4, 2005
4.0
MEDIUMCVSS 2.0
EPSS 0.75%
Description
Nortel Contivity VPN Client 2.1.7, 3.00, 3.01, 4.91, and 5.01, when opening a VPN tunnel, does not check the gateway certificate until after a dialog box has been displayed to the user, which creates a race condition that allows remote attackers to perform a man-in-the-middle (MITM) attack.
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.
AV:N/AC:H/Au:N/C:P/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.75% (0.00746) | 53.15th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.75% (0.00746) | 49.84th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.32% (0.00321) | 52.93th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.55% (0.00546) | 78.17th | v3 (v2023.03.01) |
| Mar 25, 2024 | 0.64% (0.00644) | 78.82th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.45% (0.00454) | 74.47th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.45% (0.00454) | 71.31th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
No CWE recorded.
References (6)
- http://secunia.com/advisories/12881 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://securitytracker.com/id?1011846 vdb-entryx_refsource_SECTRACK
- http://www.osvdb.org/11002 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/11495 vdb-entryx_refsource_BID
- http://www130.nortelnetworks.com/cgi-bin/eserv/cs/main.jsp?level=6&category=8&subcategory=6&subtype=&DocumentOID=276620&RenditionID=REND159588 x_refsource_CONFIRM
- https://exchange.xforce.ibmcloud.com/vulnerabilities/17812 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/12881 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://securitytracker.com/id?1011846 | vdb-entryx_refsource_SECTRACK | |
| http://www.osvdb.org/11002 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/11495 | vdb-entryx_refsource_BID | |
| http://www130.nortelnetworks.com/cgi-bin/eserv/cs/main.jsp?level=6&category=8&subcategory=6&subtype=&DocumentOID=276620&RenditionID=REND159588 | x_refsource_CONFIRM | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/17812 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.