CVE-2019-12706 Cisco Email Security Appliance Filter Bypass Vulnerability
Unauthenticated attackers can bypass email header filters on Cisco ESA devices by sending custom SPF packets, allowing malicious content to pass through.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-12706?
CVE-2019-12706 is a medium-severity vulnerability in Cisco Email Security Appliance (ESA), published on 2 Oct 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 Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the configured user filters on an affected device. The vulnerability exists because the affected software insufficiently validates certain incoming SPF messages. An attacker could exploit this vulnerability by sending a custom SPF packet to an affected device. A successful exploit could allow the attacker to bypass the configured header filters, which could allow malicious content to pass through the device.
Weakness: CWE-20
Which versions are affected by CVE-2019-12706?
It affects 1 product.
Products include Cisco Email Security Appliance Firmware.
How do I fix CVE-2019-12706?
No fix has been published for CVE-2019-12706 yet. Limit exposure of the affected software until one is available.
Is CVE-2019-12706 being exploited?
There is no known exploitation of CVE-2019-12706 in the wild and no public exploit code.
Other vulnerabilities in Cisco Email Security Appliance (ESA)
- CVE-2016-6406 Auth bypass in n/a
- CVE-2018-15453 Cisco Email Security Appliance Memory Corruption Denial of Service Vulnerability
- CVE-2017-6671 Security feature bypass in Cisco Email Security Appliance
- CVE-2016-6458 Security feature bypass in Cisco AsyncOS 10.0.0-125 and 9.7.1-066
- CVE-2019-15971 Cisco Email Security Appliance MP3 Content Filter Bypass Vulnerability
Sources
Also known as GHSA-4xfr-4873-x36j.