The JScript scripting engine 5.1, 5.6, 5.7, and 5.8 in JScript.dll in Microsoft Windows, as used in Internet Explorer, does not properly load decoded scripts into memory before execution, which allows remote attackers to execute arbitrary code via a crafted web site that triggers memory corruption, aka "JScript Remote Code Execution Vulnerability."
Published Sep 8, 2009
9.3
HIGHCVSS 2.0
EPSS 21.51%
Description
The JScript scripting engine 5.1, 5.6, 5.7, and 5.8 in JScript.dll in Microsoft Windows, as used in Internet Explorer, does not properly load decoded scripts into memory before execution, which allows remote attackers to execute arbitrary code via a crafted web site that triggers memory corruption, aka "JScript Remote Code Execution Vulnerability."
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: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 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 (35 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 21.51% (0.21507) | 97.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 21.51% (0.21507) | 97.30th | v5 (v2026.06.15) |
| Mar 27, 2026 | 43.09% (0.43094) | 97.47th | v4 (v2025.03.14) |
| Feb 28, 2026 | 46.93% (0.46926) | 97.60th | v4 (v2025.03.14) |
| Jan 28, 2026 | 50.86% (0.50857) | 97.77th | v4 (v2025.03.14) |
| Dec 28, 2025 | 49.39% (0.49387) | 97.67th | v4 (v2025.03.14) |
| Dec 27, 2025 | 40.09% (0.40088) | 97.21th | v4 (v2025.03.14) |
| Oct 28, 2025 | 49.39% (0.49387) | 97.64th | v4 (v2025.03.14) |
| Oct 27, 2025 | 40.09% (0.40088) | 97.17th | v4 (v2025.03.14) |
| Oct 1, 2025 | 49.39% (0.49387) | 97.72th | v4 (v2025.03.14) |
| Mar 30, 2025 | 39.80% (0.39802) | 97.02th | v4 (v2025.03.14) |
| Mar 29, 2025 | 43.46% (0.43461) | 96.29th | v4 (v2025.03.14) |
| Mar 17, 2025 | 39.80% (0.39802) | 96.99th | v4 (v2025.03.14) |
| Feb 11, 2025 | 55.69% (0.55687) | 97.85th | v3 (v2023.03.01) |
| Jan 5, 2025 | 43.31% (0.43308) | 97.42th | v3 (v2023.03.01) |
| Dec 17, 2024 | 49.47% (0.49466) | 97.59th | v3 (v2023.03.01) |
| Dec 2, 2024 | 51.97% (0.51968) | 97.69th | v3 (v2023.03.01) |
| Oct 28, 2024 | 59.60% (0.59598) | 97.84th | v3 (v2023.03.01) |
| Sep 21, 2024 | 68.81% (0.68809) | 98.03th | v3 (v2023.03.01) |
| Aug 15, 2024 | 71.94% (0.71940) | 98.13th | v3 (v2023.03.01) |
| Apr 18, 2024 | 77.75% (0.77748) | 98.19th | v3 (v2023.03.01) |
| Mar 8, 2024 | 81.89% (0.81886) | 98.29th | v3 (v2023.03.01) |
| Jan 26, 2024 | 87.86% (0.87862) | 98.42th | v3 (v2023.03.01) |
| Oct 27, 2023 | 92.59% (0.92595) | 98.70th | v3 (v2023.03.01) |
| Jul 28, 2023 | 93.64% (0.93637) | 98.73th | v3 (v2023.03.01) |
| Jun 14, 2023 | 94.26% (0.94262) | 98.78th | v3 (v2023.03.01) |
| May 2, 2023 | 95.40% (0.95396) | 98.98th | v3 (v2023.03.01) |
| Mar 20, 2023 | 95.63% (0.95629) | 98.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 95.85% (0.95851) | 99.03th | v3 (v2023.03.01) |
| Mar 6, 2023 | 20.46% (0.20463) | 96.47th | v2 (v2022.01.01) |
| Dec 9, 2022 | 20.46% (0.20463) | 96.36th | v2 (v2022.01.01) |
| Aug 3, 2022 | 24.17% (0.24171) | 96.67th | v2 (v2022.01.01) |
| Jul 18, 2022 | 27.68% (0.27683) | 97.11th | v2 (v2022.01.01) |
| Jul 17, 2022 | 5.39% (0.05392) | 89.42th | v2 (v2022.01.01) |
| Feb 4, 2022 | 27.68% (0.27683) | 95.92th | v2 (v2022.01.01) |
References (3)
- http://www.us-cert.gov/cas/techalerts/TA09-251A.html third-party-advisoryx_refsource_CERTUS Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-045 vendor-advisoryx_refsource_MS
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6316 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://www.us-cert.gov/cas/techalerts/TA09-251A.html | third-party-advisoryx_refsource_CERTUS Government Resource | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-045 | vendor-advisoryx_refsource_MS | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6316 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.