CVE-2017-3827 Security feature bypass in Cisco AsyncOS Software for Cisco ESA and Cisco WSA

Medium 5.8 Published 22 Feb 2017 Updated 5 Aug 2024

Remote attackers can bypass configured user filters on Cisco Email and Web Security Appliances by exploiting a MIME scanner vulnerability.

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-2017-3827?

CVE-2017-3827 is a medium-severity vulnerability in Cisco Web Security Appliance, published on 22 Feb 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Multipurpose Internet Mail Extensions (MIME) scanner of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) and Web Security Appliances (WSA) could allow an unauthenticated, remote attacker to bypass configured user filters on the device. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco ESA and Cisco WSA, both virtual and hardware appliances, that are configured with message or content filters to scan incoming email attachments on the ESA or services scanning content of web access on the WSA. More Information: SCvb91473, CSCvc76500. Known Affected Releases: 10.0.0-203 9.9.9-894 WSA10.0.0-233.

Weakness: CWE-20

Which versions are affected by CVE-2017-3827?

It affects 2 products.

Products include Cisco Email Security Appliance Firmware, Cisco Web Security Appliance.

How do I fix CVE-2017-3827?

No fix has been published for CVE-2017-3827 yet. Limit exposure of the affected software until one is available.

Is CVE-2017-3827 being exploited?

There is no known exploitation of CVE-2017-3827 in the wild and no public exploit code.

All Cisco Web Security Appliance vulnerabilities

Sources

Also known as GHSA-mr7q-8c5m-vw8x.