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CVE-2010-4344

Exim Heap-Based Buffer Overflow

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 71.7%
  1. Published14 Dec 2010
  2. Added to CISA KEV25 Mar 2022
  3. Remediation due15 Apr 2022
Actively exploited (CISA KEV)

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.

Added to KEV: 25 Mar 2022Federal remediation due: 15 Apr 2022

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Exim< 4.70
Canonical Ubuntu Linux6.06 · 8.04 · 9.10
Debian Linux5.0
Opensuse11.1 · 11.2 · 11.3

Remediation

Fixed in
Exim≥ 4.70

References

and 24 more references

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Frequently asked

Is CVE-2010-4344 being actively exploited?

Yes. CVE-2010-4344 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Mar 2022.

How severe is CVE-2010-4344?

CVE-2010-4344 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 71.7% probability of exploitation.

Which products are affected by CVE-2010-4344?

Affected products include Exim, Canonical Ubuntu Linux, Debian Linux, Opensuse.

How do I fix CVE-2010-4344?

Upgrade affected software to a fixed version, for example Exim 4.70 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2010-4344 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.