CVE-2003-0818
CVE-2003-0818 is a high-severity vulnerability in Microsoft Windows 2000 with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 84% places it in the 100th percentile, indicating an elevated likelihood of exploitation.
Key facts
- Severity: High (CVSS 2.0 base score 7.5)
- EPSS exploit prediction: 84% (100th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Microsoft Windows 2000
- Published:
- Last modified:
Description
Multiple integer overflows in Microsoft ASN.1 library (MSASN1.DLL), as used in LSASS.EXE, CRYPT32.DLL, and other Microsoft executables and libraries on Windows NT 4.0, 2000, and XP, allow remote attackers to execute arbitrary code via ASN.1 BER encodings with (1) very large length fields that cause arbitrary heap data to be overwritten, or (2) modified bit strings.
Frequently asked questions
- What is CVE-2003-0818?
- Multiple integer overflows in Microsoft ASN.1 library (MSASN1.DLL), as used in LSASS.EXE, CRYPT32.DLL, and other Microsoft executables and libraries on Windows NT 4.0, 2000, and XP, allow remote attackers to execute arbitrary code via ASN.1 BER encodings with (1) very large length fields that cause arbitrary heap data to be overwritten, or (2) modified bit strings.
- How severe is CVE-2003-0818?
- CVE-2003-0818 has a CVSS 2.0 base score of 7.5, rated high severity.
- Is CVE-2003-0818 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 84% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2003-0818?
- CVE-2003-0818 primarily affects Microsoft Windows 2000. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2003-0818?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2003-0818 published?
- CVE-2003-0818 was published on 2004-03-03 and last updated on 2026-06-16.
References
- http://marc.info/?l=bugtraq&m=107643836125615&w=2
- http://marc.info/?l=bugtraq&m=107643892224825&w=2
- http://marc.info/?l=ntbugtraq&m=107650972617367&w=2
- http://marc.info/?l=ntbugtraq&m=107650972723080&w=2
- http://www.kb.cert.org/vuls/id/216324
- http://www.kb.cert.org/vuls/id/583108
- http://www.us-cert.gov/cas/techalerts/TA04-041A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-007
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A653
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A796
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A797
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A799
Affected products (38)
- cpe:2.3:o:microsoft:windows_2000:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2000:*:sp1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2000:*:sp2:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2000:*:sp3:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2003_server:enterprise:*:64-bit:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2003_server:enterprise_64-bit:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2003_server:r2:*:64-bit:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2003_server:r2:*:datacenter_64-bit:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2003_server:standard:*:64-bit:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_2003_server:web:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:*:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:*:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:*:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp1:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp1:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp1:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp2:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp2:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp2:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp3:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp3:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp3:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp4:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp4:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp4:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp5:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp5:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp5:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp6:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp6:terminal_server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp6:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:server:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:workstation:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_xp:*:*:64-bit:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_xp:*:*:home:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_xp:*:gold:professional:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_xp:*:sp1:64-bit:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_xp:*:sp1:home:*:*:*:*:*
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