CVE-2010-4344

97
FAUCET Score

CVE-2010-4344 is a critical heap-based buffer overflow vulnerability in the string_vformat function of Exim before version 4.70, affecting distributions like Canonical, Debian, and OpenSUSE. With a CVSS score of 9.8, it allows remote attackers to execute arbitrary code via a crafted SMTP session, leading to complete compromise of confidentiality, integrity, and availability. This vulnerability is actively exploited, listed in the KEV catalog, and has publicly available exploit modules in Metasploit and ExploitDB, indicating a high risk of exploitation. The high EPSS score and significant community discussion further underscore its critical nature and widespread attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.70CPE matchmatch criteria
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
11.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:11.1:*:*:*:*:*:*:*
11.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:11.2:*:*:*:*:*:*:*
11.3CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:11.3:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
71.90%
Probability of exploitation in next 30 days
EPSS Percentile
99.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Added to KEV · Mar 25, 2022
Metasploit: Exim4 string_format Function Heap Buffer Overflow · Dec 7, 2010
ExploitDB: EDB-16925 · Dec 16, 2010
This CVE's current EPSS score of 0.7190 is in the 98th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: exim-0:4.43-1.RHEL4.5.el4_8.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4.7 Z StreamFixed in: exim-0:4.43-1.RHEL4.5.el4_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: exim-0:4.63-5.el5_5.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5.3.Z - Server OnlyFixed in: exim-0:4.63-3.el5_3.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5.4.Z - Server OnlyFixed in: exim-0:4.63-3.el5_4.1
View patch

References

bugs.exim.org / show_bug.cgi
Issue TrackingPatch
openwall.com / lists/oss-security/2010/12/10/1
Mailing ListThird Party Advisory
secunia.com / advisories/40019
Broken LinkVendor Advisory
secunia.com / advisories/42576
Broken LinkVendor Advisory
secunia.com / advisories/42586
Broken LinkVendor Advisory
secunia.com / advisories/42587
Broken LinkVendor Advisory
secunia.com / advisories/42589
Broken LinkVendor Advisory
debian.org / security/2010/dsa-2131
Mailing ListThird Party Advisory
kb.cert.org / vuls/id/682457
Third Party AdvisoryUS Government Resource
osvdb.org / 69685
Broken LinkExploitPatch
securityfocus.com / archive/1/515172/100/0/threaded
Broken LinkThird Party AdvisoryVDB Entry
securityfocus.com / bid/45308
Broken LinkThird Party AdvisoryVDB Entry
securitytracker.com / id
Broken LinkThird Party AdvisoryVDB Entry
ubuntu.com / usn/USN-1032-1
Third Party Advisory