CVE-2010-4344

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2010-11-30 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2010-12-14 16:00 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2022-03-25 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2022-04-15 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-06-16 23:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 71.7% in the next 30 days (EPSS).
• Severity: 9.8 CRITICAL (CVSS).
• Fix: a patch or advisory is linked.
• It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published

2010-12-14 16:00 UTC

Last modified

2026-06-16 23:24 UTC

Added to CISA KEV

2022-03-25

Exploit probability

71.7% · EPSS, next 30 days

Weakness

CWE-787 · Out-of-bounds write

Record status

Analyzed

Affected

• Exim < 4.70
• Opensuse 11.1
• Opensuse 11.2
• Opensuse 11.3
• Debian Linux 5.0
• Canonical Ubuntu Linux 6.06
• Canonical Ubuntu Linux 8.04
• Canonical Ubuntu Linux 9.10

Attack profile CVSS 3.1 · 9.8

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2010-4344.md and follow it. Check whether this project is affected by CVE-2010-4344. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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