CVE-2016-6356 Denial of service in Cisco AsyncOS through 9.7.0-125
Unauthenticated remote attackers can cause a denial of service on Cisco Email Security Appliances by exploiting the email message filtering feature.
- 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-2016-6356?
CVE-2016-6356 is a high-severity denial of service vulnerability in Cisco Email Security Appliance, published on 28 Oct 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliances could allow an unauthenticated, remote attacker to cause an affected device to stop scanning and forwarding email messages due to a denial of service (DoS) condition. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco Email Security Appliances, both virtual and hardware appliances, if the software is configured to apply a message filter or content filter to incoming email attachments. The vulnerability is not limited to any specific rules or actions for a message filter or content filter. More Information: CSCuz63143. Known Affected Releases: 8.5.7-042 9.7.0-125. Known Fixed Releases: 10.0.0-125 9.1.1-038 9.7.2-047.
Weakness: CWE-20
Which versions are affected by CVE-2016-6356?
It affects 1 product.
Products include Cisco Email Security Appliance.
How do I fix CVE-2016-6356?
No fix has been published for CVE-2016-6356 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-6356 being exploited?
There is no known exploitation of CVE-2016-6356 in the wild and no public exploit code.
Other vulnerabilities in Cisco Email Security Appliance
- CVE-2022-20798 Cisco Email Security Appliance and Cisco Secure Email and Web Manager External Authentication Bypass Vulnerability
- CVE-2015-6291 Denial of service in n/a
- CVE-2022-20664 Cisco Email Security Appliance and Cisco Secure Email and Web Manager Information Disclosure Vulnerability
- CVE-2022-20960 Denial of service in Cisco Secure Email
- CVE-2018-0419 Security feature bypass in Email Security Appliance (ESA)
Sources
Also known as GHSA-jjfp-c96j-c87p.