CVE-2019-1955 Cisco Email Security Appliance Header Injection Vulnerability

What is CVE-2019-1955?

CVE-2019-1955 is a medium-severity vulnerability in Cisco Email Security Appliance (ESA), published on 8 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-20

Which versions are affected by CVE-2019-1955?

It affects 1 product.

Products include Cisco Email Security Appliance Firmware.

How do I fix CVE-2019-1955?

No fix has been published for CVE-2019-1955 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-1955 being exploited?

There is no known exploitation of CVE-2019-1955 in the wild and no public exploit code.

Other vulnerabilities in Cisco Email Security Appliance (ESA)

• CVE-2016-6406 Auth bypass in n/a Critical 9.8
• CVE-2018-15453 Cisco Email Security Appliance Memory Corruption Denial of Service Vulnerability High 8.6
• CVE-2017-6671 Security feature bypass in Cisco Email Security Appliance High 7.5
• CVE-2016-6458 Security feature bypass in Cisco AsyncOS 10.0.0-125 and 9.7.1-066 High 7.5
• CVE-2019-12706 Cisco Email Security Appliance Filter Bypass Vulnerability Medium 6.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-x58p-f2fr-mr4f.