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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...

9.8 CriticalIn KEVPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

71.7%Up 23.8 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2010-4344
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
9.3 HighAV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness
CWE-787
Updated
2026-11-02
CVE List 9.8

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.

Record
CVE-2010-4344
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
EUVDEUVD-2010-4313 9.8

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.

Record
EUVD-2010-4313
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-mvgg-qcrq-7wr8 No score

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows...

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.

Record
GHSA-mvgg-qcrq-7wr8
Weakness
CWE-119
Updated
2026-11-02
CISA KEV No score

Exim Heap-Based Buffer Overflow Vulnerability

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.

Record
CVE-2010-4344
Weakness
CWE-119
Updated
2026-11-02
OSV 9.8

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.

Record
CVE-2010-4344
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2010-4344 9.8

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.

Record
DEBIAN-CVE-2010-4344
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:10017-1 No score

exim-4.86.2-2.2 on GA media

These are all security issues fixed in the exim-4.86.2-2.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10017-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
exim4
Debian:12
 before 4.70-1
4.70-1
exim4
Debian:13
 before 4.70-1
4.70-1
exim4
Debian:14
 before 4.70-1
4.70-1
exim4
Debian:5.0
 before 4.69-9+lenny1, plus listed versions
4.69-9
4.69-9+lenny1
exim
Red Hat:rhel_eus:4.7::as
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-debuginfo
Red Hat:rhel_eus:4.7::as
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-doc
Red Hat:rhel_eus:4.7::as
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-mon
Red Hat:rhel_eus:4.7::as
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-sa
Red Hat:rhel_eus:4.7::as
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
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Affected packages
PackageAffectedFixed
exim-debuginfo
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-doc
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-mon
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-sa
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-debuginfo
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-doc
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-mon
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-sa
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim
Red Hat:rhel_eus:4.7::es
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-debuginfo
Red Hat:rhel_eus:4.7::es
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-doc
Red Hat:rhel_eus:4.7::es
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-mon
Red Hat:rhel_eus:4.7::es
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim-sa
Red Hat:rhel_eus:4.7::es
 before 0:4.43-1.RHEL4.5.el4_7.1
0:4.43-1.RHEL4.5.el4_7.1
exim
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-debuginfo
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-doc
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-mon
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-sa
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-debuginfo
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-doc
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-mon
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim-sa
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.5.el4_8.1
0:4.43-1.RHEL4.5.el4_8.1
exim
Red Hat:enterprise_linux:5::client
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim-mon
Red Hat:enterprise_linux:5::client
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim-sa
Red Hat:enterprise_linux:5::client
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim
Red Hat:rhel_eus:5.3
 before 0:4.63-3.el5_3.1
0:4.63-3.el5_3.1
exim-debuginfo
Red Hat:rhel_eus:5.3
 before 0:4.63-3.el5_3.1
0:4.63-3.el5_3.1
exim-mon
Red Hat:rhel_eus:5.3
 before 0:4.63-3.el5_3.1
0:4.63-3.el5_3.1
exim-sa
Red Hat:rhel_eus:5.3
 before 0:4.63-3.el5_3.1
0:4.63-3.el5_3.1
exim
Red Hat:rhel_eus:5.4
 before 0:4.63-3.el5_4.1
0:4.63-3.el5_4.1
exim-debuginfo
Red Hat:rhel_eus:5.4
 before 0:4.63-3.el5_4.1
0:4.63-3.el5_4.1
exim-mon
Red Hat:rhel_eus:5.4
 before 0:4.63-3.el5_4.1
0:4.63-3.el5_4.1
exim-sa
Red Hat:rhel_eus:5.4
 before 0:4.63-3.el5_4.1
0:4.63-3.el5_4.1
exim
Red Hat:enterprise_linux:5::server
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim-mon
Red Hat:enterprise_linux:5::server
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim-sa
Red Hat:enterprise_linux:5::server
 before 0:4.63-5.el5_5.2
0:4.63-5.el5_5.2
exim
openSUSE:Tumbleweed
From an advisory covering 11 CVEs
 before 4.86.2-2.2
4.86.2-2.2

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
MetasploitExim4 string_format Function Heap Buffer Overflow2010-12-07
Exploit-DBExim 4.63 - Remote Command Execution2010-12-11
Exploit-DBExim4 < 4.69 - string_format Function Heap Buffer Overflow (Metasploit)2010-12-16

History

History
RecordedChangedSources
affected
exploitation, exploits
first indexedCVE List, EUVD, Exploit-DB, GitHub Advisories, CISA KEV, Metasploit, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2010-4344 is a critical vulnerability (CVSS 9.8) in Exim, published December 10, 2010. CISA lists it as known to be exploited, since March 25, 2022. EUVD reports exploitation since March 25, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 71.7%, the 99th percentile. Fixed in exim4 4.70-1.

References

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