CVE-2019-15988: Cisco Email Security Appliance URL Filtering Bypass Vulnerability
First published: Tue Nov 26 2019(Updated: )
A vulnerability in the antispam protection mechanisms of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the URL reputation filters on an affected device. The vulnerability is due to insufficient input validation of URLs. An attacker could exploit this vulnerability by crafting the URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for the affected device, which could allow malicious URLs to pass through the device.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance Firmware | <=12.5.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-15988?
CVE-2019-15988 is a vulnerability in the antispam protection mechanisms of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) that allows an unauthenticated, remote attacker to bypass URL reputation filters on an affected device.
How does CVE-2019-15988 affect Cisco Email Security Appliance Firmware?
CVE-2019-15988 affects Cisco Email Security Appliance Firmware version up to and including 12.5.0.
What is the severity of CVE-2019-15988?
The severity of CVE-2019-15988 is medium with a CVSS score of 5.3.
How can an attacker exploit CVE-2019-15988?
An attacker can exploit CVE-2019-15988 by sending specially crafted URLs to bypass URL reputation filters on an affected device.
Is there a fix for CVE-2019-15988?
Yes, Cisco has released a security advisory with guidelines on how to mitigate the vulnerability. Please refer to the Cisco Security Advisory for more information.
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