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Rewterz Threat Advisory – CVE-2019-1955 – Cisco Email Security Appliance Header Injection Vulnerability

Severity

Medium

Analysis Summary

The vulnerability is due to incomplete input and validation checking mechanisms for certain SPF messages that are sent to an affected device. An attacker could exploit this vulnerability by sending a customized SPF packet to an affected device. A successful exploit could allow the attacker to bypass the header filters that are configured for the affected device, which could allow malicious content to pass through the device.

Impact

Security bypass

Affected Vendors

Cisco

Affected Products

Cisco AsyncOS Software prior than 4.0MR1

Remediation

Please see vendor’s advisory for more details.

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-esm-inject