Skip to main content

CVE-2010-4344

Exim — Exim Heap-Based Buffer Overflow Vulnerability

Exim · CWE-787 — Out-of-bounds write · in CISA KEV since 2022-03-25

KEV since 2022 · listed over a yearCISA KEVActively Exploited
80

EVRS 80 of 100 Urgent

Patch This Cycle

Rank 607 of 2,960 tracked

Download PDF

Why it scores 80

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.717.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

exim4 -> 4.70-1

Affected versions

  • exim< 4.70
  • opensuse11.111.211.3
  • debian linux5.0
  • ubuntu linux6.068.049.10

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.717 (99.42nd pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-04-15 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. Public module exists Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by redhat. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do

Public module

Metasploit lists a public excellent-rank module for this CVE: Exim4 string_format Function Heap Buffer Overflow (unix/smtp/exim4_string_format). A module existing is not the same as active exploitation; see metasploit.com.