CVE-2015-4278: Cisco Email Security Appliance Firmware

Medium severity, CVSS 4.3. EPSS: 1.5% chance of exploitation in the next 30 days.

Cisco Email Security Appliance (ESA) devices with software 8.5.6-106 and 9.5.0-201 allow remote attackers to cause a denial of service (per-domain e-mail reception outage) by placing malformed DMARC policy data in DNS TXT records for a domain, aka Bug ID CSCuv14806.

Affected products

• Cisco Email Security Appliance Firmware: version 8.5.6-106 only; version 9.5.0-201 only

Published 2015-07-16. Last modified 2026-06-17.