ZeroDay Findings
Sign inSign up

Findings

CVE-2018-6789

Exim Buffer Overflow Vulnerability

Published Feb 8, 2018 · updated Jun 16, 2026 · exim exim

An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 8, 2018 · Catalog

    Detected

    An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

Required action

Apply updates per vendor instructions.

CISA due date May 3, 2022

Affected

  • cpe canonical/ubuntu linux14.04
  • cpe canonical/ubuntu linux16.04
  • cpe canonical/ubuntu linux17.10
  • cpe debian/debian linux7.0
  • cpe debian/debian linux8.0
  • cpe debian/debian linux9.0
  • cpe exim/eximversion unspecified
  • vendor Exim Eximversion unspecified

Sources

  • CISA KEVCVE-2018-6789

    Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.

    cisa.gov
  • CVE.orgCVE-2018-6789

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2018-6789

    30-day exploitation probability 82.1%

    first.org
  • Exploit Database44571

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

    exploit-db.com
  • Exploit Database45671

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

    exploit-db.com
  • NIST NVDCVE-2018-6789

    An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

    nvd.nist.gov
  • Packet Storm Securityhttp://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com

References