cisco-sa-esa-dos-JOm9ETfO: Cisco Email Security Appliance Denial of Service Vulnerability
First published: Wed Nov 03 2021(Updated: )
A vulnerability in the email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email through Cisco ESA. A successful exploit could allow the attacker to exhaust all the available CPU resources on an affected device for an extended period of time, preventing other emails from being processed and resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-dos-JOm9ETfO
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco AsyncOS Software | =13.7<14.0.0=13.5<13.5.4-031=13.0 and earlier<13.0.4 | 14.0.0 13.5.4-031 13.0.4 |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-esa-dos-JOm9ETfO?
The severity of cisco-sa-esa-dos-JOm9ETfO is high, as it allows unauthenticated remote attackers to perform denial of service attacks on affected devices.
How do I fix cisco-sa-esa-dos-JOm9ETfO?
To fix cisco-sa-esa-dos-JOm9ETfO, upgrade to a patched version of Cisco AsyncOS Software that is not vulnerable.
What products are affected by cisco-sa-esa-dos-JOm9ETfO?
Cisco AsyncOS software versions 13.0 and earlier, 13.5 and specific patches, and up to 14.0.0 are affected by cisco-sa-esa-dos-JOm9ETfO.
What are the potential impacts of cisco-sa-esa-dos-JOm9ETfO?
The potential impacts of cisco-sa-esa-dos-JOm9ETfO include service disruption and denial of service, affecting the availability of email services.
Is authentication required for exploiting cisco-sa-esa-dos-JOm9ETfO?
No, authentication is not required to exploit cisco-sa-esa-dos-JOm9ETfO, making it particularly concerning.
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- version/cisco asyncos software/13.0 and earlier