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    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 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.

    Published:Sep 6, 2003
    Last Modified:Apr 16, 2026
    EPS:Sep 6, 2003
    EPSS Score:0.07018
    CVSS Score:7.5

    Affected Products

    Vendor
    University Of Cambridge
    Product
    Exim

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2005-0021 (CVSS 7.2) — Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 ad…
    CVE-2005-0022 (CVSS 4.6) — Buffer overflow in the spa_base64_to_bits function in Exim before 4.43, as originally obtained from Samba code…
    CVE-2004-0399 (CVSS 7.5) — Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the sender_verify option is true, …
    CVE-2004-0400 (CVSS 7.5) — Stack-based buffer overflow in Exim 4 before 4.33, when the headers_check_syntax option is enabled, allows rem…
    CVE-2002-1381 (CVSS 7.2) — Format string vulnerability in daemon.c for Exim 4.x through 4.10, and 3.x through 3.36, allows exim administr…
    CVE-2002-0274 (CVSS 4.6) — Exim 3.34 and earlier may allow local users to gain privileges via a buffer overflow in long -C (configuration…
    CVE-2001-0889 (CVSS 7.5) — Exim 3.22 and earlier, in some configurations, does not properly verify the local part of an address when redi…
    CVE-2001-0690 (CVSS 7.5) — Format string vulnerability in exim (3.22-10 in Red Hat, 3.12 in Debian and 3.16 in Conectiva) in batched SMTP…
    CVE-1999-0971 (CVSS 7.2) — Buffer overflow in Exim allows local users to gain root privileges via a long :include: option in a .forward f…

    References

    http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000735
    http://marc.info/?l=bugtraq&m=106252015820395&w=2
    http://marc.info/?l=vuln-dev&m=106264740820334&w=2
    http://packages.debian.org/changelogs/pool/main/e/exim/exim_3.36-13/changelog
    http://packages.debian.org/changelogs/pool/main/e/exim4/exim4_4.34-10/changelog
    http://www.debian.org/security/2003/dsa-376
    http://www.exim.org/pipermail/exim-announce/2003q3/000094.html
    http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057720.html
    http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057809.html
    http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000735
    http://marc.info/?l=bugtraq&m=106252015820395&w=2
    http://marc.info/?l=vuln-dev&m=106264740820334&w=2
    http://packages.debian.org/changelogs/pool/main/e/exim/exim_3.36-13/changelog
    http://packages.debian.org/changelogs/pool/main/e/exim4/exim4_4.34-10/changelog
    http://www.debian.org/security/2003/dsa-376
    http://www.exim.org/pipermail/exim-announce/2003q3/000094.html
    http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057720.html
    http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057809.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High