CVE-2019-1955: Cisco Email Security Appliance Header Injection Vulnerability
A vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to bypass configured user filters on the device. 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.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2019-1955?
CVE-2019-1955 is a vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA).
What is the severity of CVE-2019-1955?
The severity of CVE-2019-1955 is high, with a severity value of 7.5.
How does CVE-2019-1955 affect Cisco Email Security Appliances (ESA)?
CVE-2019-1955 allows an unauthenticated, remote attacker to bypass configured user filters on Cisco Email Security Appliances (ESA).
How can I fix CVE-2019-1955?
To fix CVE-2019-1955, apply the necessary updates and patches provided by Cisco.
Where can I find more information about CVE-2019-1955?
You can find more information about CVE-2019-1955 on the Cisco Security Advisory page: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-esm-inject