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Critical 9.8Known exploited (CISA KEV)Published Dec 14, 2010
CVE-2010-4344Heap-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 conj…
Updated under an hour ago ()
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It affects exim and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 25, 2022; federal agencies had to remediate by Apr 15, 2022. Treat that date as your deadline.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-787
- Known exploited
- Added to CISA KEV Mar 25, 2022; federal remediation due Apr 15, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 71.71% (percentile 99)
- Assigned by
- redhat
- NVD analysis
- Analyzed
- Record last updated
- Oct 22, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
exim exim exim:exim | before 4.70 | NVD |
opensuse opensuse opensuse:opensuse | 11.1; 11.2; 11.3 | NVD |
debian debian_linux debian:debian_linux | 5.0 | NVD |
canonical ubuntu_linux canonical:ubuntu_linux | 6.06; 8.04; 9.10 | NVD |
References
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.htmlvendor-advisory, x-refsource-suse, mailing-list, third-party-advisory
- http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.htmlmailing-list, x-refsource-mlist, exploit
- http://bugs.exim.org/show_bug.cgi?id=787x-refsource-confirm, issue-tracking, patch
- http://www.securitytracker.com/id?1024858vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
- http://www.redhat.com/support/errata/RHSA-2010-0970.htmlvendor-advisory, x-refsource-redhat, broken-link
- http://www.vupen.com/english/advisories/2010/3186vdb-entry, x-refsource-vupen
- http://www.securityfocus.com/bid/45308vdb-entry, x-refsource-bid, broken-link, third-party-advisory
- http://www.metasploit.com/modules/exploit/unix/smtp/exim4_string_formatx-refsource-misc, third-party-advisory
- http://atmail.com/blog/2010/atmail-6204-now-available/x-refsource-confirm, broken-link
- http://secunia.com/advisories/42576third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
- http://secunia.com/advisories/42587third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=661756x-refsource-confirm
- http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.htmlmailing-list, x-refsource-mlist, patch
- http://secunia.com/advisories/40019third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
- http://www.vupen.com/english/advisories/2010/3172vdb-entry, x-refsource-vupen
- http://www.kb.cert.org/vuls/id/682457third-party-advisory, x-refsource-cert-vn, us-government-resource
- http://www.vupen.com/english/advisories/2010/3181vdb-entry, x-refsource-vupen
- http://secunia.com/advisories/42586third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
- http://www.vupen.com/english/advisories/2010/3317vdb-entry, x-refsource-vupen
- http://www.ubuntu.com/usn/USN-1032-1vendor-advisory, x-refsource-ubuntu, third-party-advisory
- http://www.cpanel.net/2010/12/exim-remote-memory-corruption-vulnerability-notification-cve-2010-4344.htmlx-refsource-confirm, broken-link
- http://www.osvdb.org/69685vdb-entry, x-refsource-osvdb, broken-link, exploit, patch
- http://www.securityfocus.com/archive/1/515172/100/0/threadedmailing-list, x-refsource-bugtraq, broken-link, third-party-advisory, vdb-entry
- http://www.theregister.co.uk/2010/12/11/exim_code_execution_peril/x-refsource-misc, press/media-coverage
- http://www.vupen.com/english/advisories/2010/3246vdb-entry, x-refsource-vupen
- http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6bmailing-list, patch
- http://openwall.com/lists/oss-security/2010/12/10/1mailing-list, third-party-advisory
- http://secunia.com/advisories/42589broken-link, vendor-advisory
- http://www.debian.org/security/2010/dsa-2131mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7exploit, mailing-list
- http://www.vupen.com/english/advisories/2010/3171broken-link, vendor-advisory
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