CVE-2003-0743: n/a vulnerability

CVE-2003-0743: Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may a...

Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute arbitrary code via an invalid (1) HELO or (2) EHLO argument with a large number of spaces followed by a NULL character and a newline, which is not properly trimmed before the "(no argument given)" string is appended to the buffer.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 02:05 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2003-0743 is an old Exim mail server flaw that could let a remote sender crash or potentially run code on vulnerable servers. The affected versions are Exim 3 before 3.36 and Exim 4 before 4.21. No provided source shows active exploitation. Exposure is mainly legacy internet-facing SMTP servers still running Exim 3.x before 3.36 or Exim 4.x before 4.21, including distribution builds that did not backport the fix. Modern supported Exim deployments are unlikely to be affected unless frozen on old packages. Treat this as a legacy exposure cleanup item with elevated priority for internet-facing mail servers. It is not listed as actively exploited in the provided sources, but vulnerable Exim versions are far beyond normal support and should be upgraded or retired. Mitigation focus: Upgrade Exim 3 to 3.36 or later.; Upgrade Exim 4 to 4.21 or later.; Apply Debian or Conectiva security updates where those packages are used..

Prepared: Jun 30, 2026, 08:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 6, 2003, 04:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

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1Source links

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

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