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    CVE-2010-4344

    Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

    Published:Dec 7, 2010
    Last Modified:Apr 21, 2026
    EPS:Dec 14, 2010
    EPSS Score:0.53064
    CVSS Score:9.8

    CISA Notification

    Description

    Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Apr 15, 2022
    1610 days ago
    Alert Date
    Mar 25, 2022
    1631 days ago

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Exim
    Product
    Exim
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.htmlhttp://www.openwall.com/lists/oss-security/2021/05/04/7http://www.osvdb.org/69685https://bugzilla.redhat.com/show_bug.cgi?id=661756http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.htmlhttp://www.openwall.com/lists/oss-security/2021/05/04/7http://www.osvdb.org/69685https://bugzilla.redhat.com/show_bug.cgi?id=661756https://www.exploit-db.com/exploits/15725https://www.exploit-db.com/exploits/16925

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.70
    http://atmail.com/blog/2010/atmail-6204-now-available/
    http://bugs.exim.org/show_bug.cgi?id=787
    http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6b
    http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.html
    http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.html
    http://openwall.com/lists/oss-security/2010/12/10/1
    http://secunia.com/advisories/40019
    http://secunia.com/advisories/42576
    http://secunia.com/advisories/42586
    http://secunia.com/advisories/42587
    http://secunia.com/advisories/42589
    http://www.cpanel.net/2010/12/exim-remote-memory-corruption-vulnerability-notification-cve-2010-4344.html
    http://www.debian.org/security/2010/dsa-2131
    http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.html
    http://www.kb.cert.org/vuls/id/682457
    http://www.metasploit.com/modules/exploit/unix/smtp/exim4_string_format
    http://www.openwall.com/lists/oss-security/2021/05/04/7
    http://www.osvdb.org/69685
    http://www.redhat.com/support/errata/RHSA-2010-0970.html
    http://www.securityfocus.com/archive/1/515172/100/0/threaded
    http://www.securityfocus.com/bid/45308
    http://www.securitytracker.com/id?1024858
    http://www.theregister.co.uk/2010/12/11/exim_code_execution_peril/
    http://www.ubuntu.com/usn/USN-1032-1
    http://www.vupen.com/english/advisories/2010/3171
    http://www.vupen.com/english/advisories/2010/3172
    http://www.vupen.com/english/advisories/2010/3181
    http://www.vupen.com/english/advisories/2010/3186
    http://www.vupen.com/english/advisories/2010/3204
    http://www.vupen.com/english/advisories/2010/3246
    http://www.vupen.com/english/advisories/2010/3317
    https://bugzilla.redhat.com/show_bug.cgi?id=661756
    ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.70
    http://atmail.com/blog/2010/atmail-6204-now-available/
    http://bugs.exim.org/show_bug.cgi?id=787
    http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6b
    http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.html
    http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.html
    http://openwall.com/lists/oss-security/2010/12/10/1
    http://secunia.com/advisories/40019
    http://secunia.com/advisories/42576
    http://secunia.com/advisories/42586
    http://secunia.com/advisories/42587
    http://secunia.com/advisories/42589
    http://www.cpanel.net/2010/12/exim-remote-memory-corruption-vulnerability-notification-cve-2010-4344.html
    http://www.debian.org/security/2010/dsa-2131
    http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.html
    http://www.kb.cert.org/vuls/id/682457
    http://www.metasploit.com/modules/exploit/unix/smtp/exim4_string_format
    http://www.openwall.com/lists/oss-security/2021/05/04/7
    http://www.osvdb.org/69685
    http://www.redhat.com/support/errata/RHSA-2010-0970.html
    http://www.securityfocus.com/archive/1/515172/100/0/threaded
    http://www.securityfocus.com/bid/45308
    http://www.securitytracker.com/id?1024858
    http://www.theregister.co.uk/2010/12/11/exim_code_execution_peril/
    http://www.ubuntu.com/usn/USN-1032-1
    http://www.vupen.com/english/advisories/2010/3171
    http://www.vupen.com/english/advisories/2010/3172
    http://www.vupen.com/english/advisories/2010/3181
    http://www.vupen.com/english/advisories/2010/3186
    http://www.vupen.com/english/advisories/2010/3204
    http://www.vupen.com/english/advisories/2010/3246
    http://www.vupen.com/english/advisories/2010/3317
    https://bugzilla.redhat.com/show_bug.cgi?id=661756
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2010-4344

    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