CVE-2020-3548: Cisco Email Security Appliance Denial Of Service Vulnerability
First published: Mon Nov 18 2024(Updated: )
A vulnerability in the Transport Layer Security (TLS) protocol implementation of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient processing of incoming TLS traffic. An attacker could exploit this vulnerability by sending a series of crafted TLS packets to an affected device. A successful exploit could allow the attacker to trigger a prolonged state of high CPU utilization. The affected device would still be operative, but response time and overall performance may be degraded.There are no workarounds that address this vulnerability.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance Firmware |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-3548?
CVE-2020-3548 is classified as a high-severity vulnerability due to its potential to cause denial of service.
How do I fix CVE-2020-3548?
To mitigate CVE-2020-3548, it is recommended to apply the latest firmware updates to your Cisco Email Security Appliance.
Who is affected by CVE-2020-3548?
CVE-2020-3548 affects Cisco Email Security Appliances running vulnerable versions of AsyncOS with TLS protocol implementation issues.
What types of attacks can be executed via CVE-2020-3548?
An unauthenticated, remote attacker can exploit CVE-2020-3548 to trigger high CPU usage, leading to a denial of service condition on the affected devices.
Is CVE-2020-3548 exploitable remotely?
Yes, CVE-2020-3548 can be exploited remotely by attackers without authentication.
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