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Findings

CVE-2010-4344

Exim Heap-Based Buffer Overflow Vulnerability

Published Dec 14, 2010 · corrected/updated Jun 16, 2026 · n/a n/a · evidence confidence very high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2010-4344 is a critical public vulnerability record for n/a n/a. CISA lists it as known exploited. Published remediation guidance: Apply updates per vendor instructions. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether n/a n/a is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: canonical/ubuntu linux (6.06); canonical/ubuntu linux (8.04); canonical/ubuntu linux (9.10); debian/debian linux (5.0). Published remediation guidance: Apply updates per vendor instructions. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 9.8, EPSS 71.7%. CISA lists it as known exploited. Weakness classes: CWE-119, CWE-787. Sources contributing to this record: cisa_kev, cve_org, epss, exploitdb. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Confirmed in CISA KEV since Mar 25, 2022. Listed in the CISA Known Exploited Vulnerabilities catalog.

  • Patch and remediation

    Apply updates per vendor instructions. CISA due date Apr 15, 2022.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 14, 2010 · Catalog

    Detected

    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.

  2. Mar 25, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Apr 15, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

  • cpe canonical/ubuntu linux6.06
  • cpe canonical/ubuntu linux8.04
  • cpe canonical/ubuntu linux9.10
  • cpe debian/debian linux5.0
  • cpe exim/eximversion unspecified
  • cpe opensuse/opensuse11.1
  • cpe opensuse/opensuse11.2
  • cpe opensuse/opensuse11.3
  • vendor Exim Eximversion unspecified
  • vendor n/a n/aversion unspecified

Sources

  • CISA KEVConfirmed exploitationCVE-2010-4344

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2010-4344

    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 reje

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2010-4344

    30-day exploitation probability 71.7%

    first.org
  • Exploit DatabasePublic exploit reference15725

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Exploit DatabasePublic exploit reference16925

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Metasploit ModulesPublic exploit moduleexploit_unix/smtp/exim4_string_format

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2010-4344

    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 reje

    nvd.nist.gov

References