CVE-2003-0209

NONECVSS 0.0Weaponized

0.0

Integer overflow in the TCP stream reassembly module (stream4) for Snort 2.0 and earlier allows remote attackers to execute arbitrary code via large sequence numbers in packets, which enable a heap-based buffer overflow.

CVSS v3: —
EG Score: —
EPSS: 98.2%
KEV: Not listed

Published

May 5, 2003

Last Modified

April 16, 2026

References (22)

cve@mitrehttp://marc.info/?l=bugtraq&m=105043563016235&w=2
cve@mitrehttp://marc.info/?l=bugtraq&m=105103586927007&w=2
cve@mitrehttp://marc.info/?l=bugtraq&m=105111217731583&w=2
cve@mitrehttp://marc.info/?l=bugtraq&m=105154530427824&w=2
cve@mitrehttp://marc.info/?l=bugtraq&m=105172790914107&w=2
cve@mitrehttp://www.cert.org/advisories/CA-2003-13.html
cve@mitrehttp://www.coresecurity.com/common/showdoc.php?idx=313&idxseccion=10
cve@mitrehttp://www.debian.org/security/2003/dsa-297
cve@mitrehttp://www.kb.cert.org/vuls/id/139129
cve@mitrehttp://www.mandriva.com/security/advisories?name=MDKSA-2003:052
cve@mitrehttp://www.securityfocus.com/bid/7178
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=105043563016235&w=2
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=105103586927007&w=2
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=105111217731583&w=2
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=105154530427824&w=2

Data Freshness Timeline

(refreshed 8× in last 7d / 13× 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
2026-05-27 13:37 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-18✓ verified
First seen Apr 23, 2003
Snort 1.9.1 - 'p7snort191.sh' Remote Command Execution
Open source ↗

Frequently asked(4)

What is CVE-2003-0209?

CVE-2003-0209 is a none vulnerability published on May 5, 2003. Integer overflow in the TCP stream reassembly module (stream4) for Snort 2.0 and earlier allows remote attackers to execute arbitrary code via large sequence numbers in packets, which enable a heap-based buffer overflow.

When was CVE-2003-0209 disclosed?

CVE-2003-0209 was first published in the National Vulnerability Database on May 5, 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-2003-0209 actively exploited?

CVE-2003-0209 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2003-0209?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2003-0209, 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-2003-0209

📅 Published

🔄 Last Modified

🔗 References (22)