CVE-2010-4344

CRITICAL
9.8
CVSS Score
Published: December 14, 2010 at 03:00 PM UTC
Updated: June 16, 2026 at 11:24 PM UTC
4 products affected across 4 vendorsDebian LinuxUbuntu LinuxopenSUSE

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 72%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score71.7%

EPSS (Exploit Prediction Scoring System) estimates a 71.7% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Mar 25, 2022
Remediation Due
Apr 15, 2022
1656 days overdue

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.70
Affected range stops below 4.70, so it looks safe — our inference, not a vendor statement

References (34)

x_refsource_CONFIRMIssue TrackingPatch
http://bugs.exim.org/show_bug.cgi?id=787
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.html
Mailing Listx_refsource_MLISTThird Party Advisory
http://openwall.com/lists/oss-security/2010/12/10/1
Third Party Advisoryx_refsource_SECUNIABroken LinkVendor Advisory
http://secunia.com/advisories/40019

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-787

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