The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka "Internet Authentication Service Memory Corruption Vulnerability."
Published Dec 9, 2009
10.0
HIGHCVSS 2.0
EPSS 31.61%
Description
The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka "Internet Authentication Service Memory Corruption Vulnerability."
Affected products
No data.
- n/a
- sp2
- sp2
- n/a
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:L/Au:N/C:C/I:C/A:C
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 (27 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 31.61% (0.31611) | 98.25th | v5 (v2026.06.15) |
| Jun 15, 2026 | 31.61% (0.31611) | 98.06th | v5 (v2026.06.15) |
| Mar 30, 2025 | 47.85% (0.47852) | 97.47th | v4 (v2025.03.14) |
| Mar 29, 2025 | 61.03% (0.61026) | 97.58th | v4 (v2025.03.14) |
| Mar 17, 2025 | 47.85% (0.47852) | 97.43th | v4 (v2025.03.14) |
| Mar 4, 2025 | 29.57% (0.29569) | 97.00th | v3 (v2023.03.01) |
| Jan 28, 2025 | 36.89% (0.36890) | 97.24th | v3 (v2023.03.01) |
| Dec 22, 2024 | 33.38% (0.33380) | 97.07th | v3 (v2023.03.01) |
| Dec 17, 2024 | 30.10% (0.30102) | 96.93th | v3 (v2023.03.01) |
| Dec 12, 2024 | 23.34% (0.23339) | 96.75th | v3 (v2023.03.01) |
| Jun 8, 2024 | 24.19% (0.24189) | 96.62th | v3 (v2023.03.01) |
| Apr 27, 2024 | 37.95% (0.37945) | 97.18th | v3 (v2023.03.01) |
| Jan 27, 2024 | 45.63% (0.45631) | 97.10th | v3 (v2023.03.01) |
| Dec 12, 2023 | 50.49% (0.50489) | 97.23th | v3 (v2023.03.01) |
| Sep 14, 2023 | 54.54% (0.54540) | 97.20th | v3 (v2023.03.01) |
| Aug 2, 2023 | 67.37% (0.67372) | 97.48th | v3 (v2023.03.01) |
| Jun 20, 2023 | 75.85% (0.75846) | 97.71th | v3 (v2023.03.01) |
| May 7, 2023 | 79.65% (0.79648) | 97.77th | v3 (v2023.03.01) |
| Mar 7, 2023 | 79.37% (0.79373) | 97.70th | v3 (v2023.03.01) |
| Mar 6, 2023 | 42.45% (0.42445) | 98.29th | v2 (v2022.01.01) |
| Jan 7, 2023 | 42.45% (0.42445) | 98.26th | v2 (v2022.01.01) |
| Nov 3, 2022 | 45.14% (0.45143) | 98.31th | v2 (v2022.01.01) |
| Aug 30, 2022 | 49.70% (0.49704) | 98.55th | v2 (v2022.01.01) |
| Jul 18, 2022 | 56.37% (0.56371) | 98.75th | v2 (v2022.01.01) |
| Jul 17, 2022 | 6.52% (0.06523) | 90.96th | v2 (v2022.01.01) |
| Apr 17, 2022 | 56.37% (0.56371) | 98.68th | v2 (v2022.01.01) |
| Feb 4, 2022 | 58.31% (0.58315) | 98.56th | v2 (v2022.01.01) |
References (4)
- http://www.securitytracker.com/id?1023291 vdb-entryx_refsource_SECTRACK
- http://www.us-cert.gov/cas/techalerts/TA09-342A.html third-party-advisoryx_refsource_CERTUS Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071 vendor-advisoryx_refsource_MS
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://www.securitytracker.com/id?1023291 | vdb-entryx_refsource_SECTRACK | |
| http://www.us-cert.gov/cas/techalerts/TA09-342A.html | third-party-advisoryx_refsource_CERTUS Government Resource | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071 | vendor-advisoryx_refsource_MS | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.