The CryptoAPI component in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7, as used by Internet Explorer and other applications, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, aka "Null Truncation in X.509 Common Name Vulnerability," a related issue to CVE-2009-2408
Published Oct 14, 2009
6.8
MEDIUMCVSS 2.0
EPSS 5.32%
Description
The CryptoAPI component in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7, as used by Internet Explorer and other applications, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, aka "Null Truncation in X.509 Common Name Vulnerability," a related issue to CVE-2009-2408.
Affected products
No data.
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
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:M/Au:N/C:P/I:P/A:P
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 3, 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 (25 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 5.32% (0.05321) | 92.36th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.32% (0.05321) | 91.53th | v5 (v2026.06.15) |
| Mar 30, 2025 | 17.22% (0.17223) | 94.48th | v4 (v2025.03.14) |
| Mar 29, 2025 | 22.05% (0.22051) | 93.14th | v4 (v2025.03.14) |
| Mar 17, 2025 | 17.22% (0.17223) | 94.52th | v4 (v2025.03.14) |
| Dec 12, 2024 | 94.62% (0.94617) | 99.34th | v3 (v2023.03.01) |
| Jul 4, 2024 | 94.44% (0.94438) | 99.23th | v3 (v2023.03.01) |
| May 24, 2024 | 94.28% (0.94284) | 99.18th | v3 (v2023.03.01) |
| Apr 13, 2024 | 95.05% (0.95052) | 99.28th | v3 (v2023.03.01) |
| Mar 2, 2024 | 95.56% (0.95555) | 99.34th | v3 (v2023.03.01) |
| Dec 2, 2023 | 96.28% (0.96283) | 99.40th | v3 (v2023.03.01) |
| Sep 2, 2023 | 96.54% (0.96539) | 99.43th | v3 (v2023.03.01) |
| Jul 20, 2023 | 96.74% (0.96744) | 99.48th | v3 (v2023.03.01) |
| Jun 7, 2023 | 96.91% (0.96909) | 99.55th | v3 (v2023.03.01) |
| Apr 25, 2023 | 97.04% (0.97041) | 99.58th | v3 (v2023.03.01) |
| Mar 12, 2023 | 96.95% (0.96951) | 99.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 97.04% (0.97041) | 99.55th | v3 (v2023.03.01) |
| Mar 6, 2023 | 11.80% (0.11805) | 95.16th | v2 (v2022.01.01) |
| Jan 14, 2023 | 11.80% (0.11805) | 94.97th | v2 (v2022.01.01) |
| Sep 8, 2022 | 14.22% (0.14225) | 95.62th | v2 (v2022.01.01) |
| Jul 18, 2022 | 15.38% (0.15383) | 95.76th | v2 (v2022.01.01) |
| Jul 17, 2022 | 1.11% (0.01108) | 52.96th | v2 (v2022.01.01) |
| Jul 5, 2022 | 15.38% (0.15383) | 95.72th | v2 (v2022.01.01) |
| Apr 1, 2022 | 21.61% (0.21605) | 96.29th | v2 (v2022.01.01) |
| Feb 4, 2022 | 21.61% (0.21605) | 94.23th | v2 (v2022.01.01) |
References (7)
- http://www.networkworld.com/news/2009/073009-more-holes-found-in-webs.html x_refsource_MISC
- http://www.networkworld.com/news/2009/091709-microsoft-ie-security-hole.html x_refsource_MISC
- http://www.securityfocus.com/bid/36475 vdb-entryx_refsource_BID
- http://www.us-cert.gov/cas/techalerts/TA09-286A.html third-party-advisoryx_refsource_CERTUS Government Resource
- http://www.wired.com/threatlevel/2009/07/kaminsky/ x_refsource_MISC
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-056 vendor-advisoryx_refsource_MS
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5842 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://www.networkworld.com/news/2009/073009-more-holes-found-in-webs.html | x_refsource_MISC | |
| http://www.networkworld.com/news/2009/091709-microsoft-ie-security-hole.html | x_refsource_MISC | |
| http://www.securityfocus.com/bid/36475 | vdb-entryx_refsource_BID | |
| http://www.us-cert.gov/cas/techalerts/TA09-286A.html | third-party-advisoryx_refsource_CERTUS Government Resource | |
| http://www.wired.com/threatlevel/2009/07/kaminsky/ | x_refsource_MISC | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-056 | vendor-advisoryx_refsource_MS | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5842 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.