Input validation error in Cisco AsyncOS for Cisco Email Security Appliance - CVE-2019-12706
Published: February 20, 2020
Vulnerability identifier: #VU25479
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-12706
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass the configured user filters on an affected device.
The vulnerability exists within the Sender Policy Framework (SPF) functionality due to the affected software insufficiently validates certain incoming SPF messages. A remote attacker can send a custom SPF packet to an affected device and bypass the configured header filters, which could allow malicious content to pass through the device.
Affected software
Cisco AsyncOS for Cisco Email Security Appliance
How to mitigate CVE-2019-12706
Install updates from vendor's website.
Cisco AsyncOS for Cisco Email Security Appliance - update to 12.5.1