CVE-2003-0543

NONECVSS 0.0Weaponized

0.0

Integer overflow in OpenSSL 0.9.6 and 0.9.7 allows remote attackers to cause a denial of service (crash) via an SSL client certificate with certain ASN.1 tag values.

CVSS v3: —
EG Score: —
EPSS: 97.6%
KEV: Not listed

Published

November 17, 2003

Last Modified

April 16, 2026

References (32)

cve@mitrehttp://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=104893
cve@mitrehttp://secunia.com/advisories/22249
cve@mitrehttp://sunsolve.sun.com/search/document.do?assetkey=1-66-201029-1
cve@mitrehttp://www-1.ibm.com/support/docview.wss?uid=swg21247112
cve@mitrehttp://www.cert.org/advisories/CA-2003-26.html
cve@mitrehttp://www.debian.org/security/2003/dsa-393
cve@mitrehttp://www.debian.org/security/2003/dsa-394
cve@mitrehttp://www.kb.cert.org/vuls/id/255484
cve@mitrehttp://www.linuxsecurity.com/advisories/engarde_advisory-3693.html
cve@mitrehttp://www.redhat.com/support/errata/RHSA-2003-291.html
cve@mitrehttp://www.redhat.com/support/errata/RHSA-2003-292.html
cve@mitrehttp://www.securityfocus.com/bid/8732
cve@mitrehttp://www.uniras.gov.uk/vuls/2003/006489/openssl.htm
cve@mitrehttp://www.vupen.com/english/advisories/2006/3900
cve@mitrehttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4254

Data Freshness Timeline

(refreshed 12× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:11 UTCOSV refresh
2026-05-27 13:37 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-18 21:29 UTCepss_batch
2026-05-18 21:29 UTCepss_batch

Publicly available exploits

(1 reference)

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

Exploit-DBEDB-146✓ verified
First seen Oct 9, 2003
OpenSSL ASN.1 < 0.9.6j/0.9.7b - Brute Forcer for Parsing Bugs
Open source ↗

Frequently asked(4)

What is CVE-2003-0543?

CVE-2003-0543 is a none vulnerability published on November 17, 2003. Integer overflow in OpenSSL 0.9.6 and 0.9.7 allows remote attackers to cause a denial of service (crash) via an SSL client certificate with certain ASN.1 tag values.

When was CVE-2003-0543 disclosed?

CVE-2003-0543 was first published in the National Vulnerability Database on November 17, 2003, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2003-0543 actively exploited?

CVE-2003-0543 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2003-0543?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2003-0543, 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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CVE-2003-0543

📅 Published

🔄 Last Modified

🔗 References (32)