CVE-2003-0818

NONECVSS 0.09.0▲
EchelonGraph scoreLOW confidence

Score elevated to 9.0 because EPSS predicts 90% probability of exploitation within the next 30 days (top 0.4% of all CVEs). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss
Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 84%
CISA-KEV: Not listedEPSS: 84%CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
—
EG Score
9.0(low)
EPSS
99.7%
KEV
Not listed

Published

March 3, 2004

Last Modified

June 16, 2026

References (24)

Data Freshness Timeline

(refreshed 0× in last 7d / 11× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-04 06:26 UTCEPSS rescore
  2. 2026-06-27 03:04 UTCEPSS rescore
  3. 2026-06-23 21:29 UTCEPSS rescore
  4. 2026-06-21 01:56 UTCEPSS rescore
  5. 2026-06-17 17:49 UTCEPSS rescore
  6. 2026-06-17 17:49 UTCEPSS rescore
  7. 2026-06-16 17:49 UTCEPSS rescore
  8. 2026-06-16 17:49 UTCEPSS rescore
  9. 2026-06-15 17:43 UTCEPSS rescore
  10. 2026-06-14 23:13 UTCEPSS rescore
  11. 2026-06-14 23:13 UTCEPSS rescore
  12. 2026-06-13 22:56 UTCEPSS rescore
  13. 2026-06-10 22:13 UTCEPSS rescore
  14. 2026-06-10 13:17 UTCEPSS rescore
  15. 2026-06-07 15:21 UTCEPSS rescore
  16. 2026-06-06 13:44 UTCEPSS rescore
  17. 2026-06-06 13:44 UTCEPSS rescore
  18. 2026-06-06 13:44 UTCEPSS rescore
  19. 2026-06-05 22:43 UTCEPSS rescore
  20. 2026-06-05 22:43 UTCEPSS rescore
  21. 2026-06-04 13:09 UTCEPSS rescore
  22. 2026-06-02 20:10 UTCEPSS rescore
  23. 2026-05-31 16:33 UTCEG score recompute
  24. 2026-05-31 16:33 UTCGHSA enrichment
  25. 2026-05-29 13:40 UTCEPSS rescore
Show 13 more
  1. 2026-05-29 13:40 UTCEPSS rescore
  2. 2026-05-28 13:42 UTCEPSS rescore
  3. 2026-05-28 13:42 UTCEPSS rescore
  4. 2026-05-28 13:42 UTCEPSS rescore
  5. 2026-05-26 13:41 UTCEPSS rescore
  6. 2026-05-26 13:41 UTCEPSS rescore
  7. 2026-05-26 07:16 UTCEPSS rescore
  8. 2026-05-26 07:16 UTCEPSS rescore
  9. 2026-05-20 22:36 UTCEPSS rescore
  10. 2026-05-20 11:20 UTCEPSS rescore
  11. 2026-05-20 11:20 UTCEPSS rescore
  12. 2026-05-18 21:29 UTCEPSS rescore
  13. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (1 Metasploit module) (3 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16377✓ verified
    First seen Jul 25, 2010

    Microsoft Windows - ASN.1 Library Bitstring Heap Overflow (MS04-007) (Metasploit)

    Open source ↗
  • Exploit-DBEDB-3022✓ verified
    First seen Mar 26, 2004

    Microsoft Windows - ASN.1 Remote (MS04-007)

    Open source ↗
  • Exploit-DBEDB-153✓ verified
    First seen Feb 14, 2004

    Microsoft Windows - ASN.1 'LSASS.exe' Remote Denial of Service (MS04-007)

    Open source ↗
  • Metasploitexploit/windows/smb/ms04_007_killbill✓ verified
    First seen Feb 10, 2004

    MS04-007 Microsoft ASN.1 Library Bitstring Heap Overflow

    Open source ↗

Frequently asked(4)

What is CVE-2003-0818?
CVE-2003-0818 is a none vulnerability published on March 3, 2004. 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…
When was CVE-2003-0818 disclosed?
CVE-2003-0818 was first published in the National Vulnerability Database on March 3, 2004, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2003-0818 actively exploited?
CVE-2003-0818 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2003-0818?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2003-0818, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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