Is CVE-2010-4344 in the CISA KEV catalog?

Yes. CVE-2010-4344 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-25.

What is the CVSS severity of CVE-2010-4344?

CVE-2010-4344 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2010-4344?

CVE-2010-4344 has an EPSS score of 71.90% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2010-4344?

Upgrade exim4 on debian 11 to 4.70-1 or later.

CVE & CISA-KEV Catalog

CVE-2010-4344

CRITICALCISA KEVEPSS 99th pctl

9.8

CVSS v3

NVD

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.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

exim4Debian

Fixed in:4.70-1CVE-2010-4344

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

71.90%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

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.

Apply updates per vendor instructions.

Remediation due: 2022-04-15

References

Patch4

Exploit3

Vendor Advisory11

Third-Party Advisory9

Government Resource1

cisa.gov

Press / Media1

theregister.co.uk

Other references4

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.