Executive Summary

Title Cisco Email Security Appliance Denial of Service Vulnerability
Name cisco-sa-20170920-esa First vendor Publication 2017-09-20
Vendor Cisco Last vendor Modification 2017-09-20
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


A vulnerability in the email message filtering feature of Cisco AsyncOS Software for the Cisco Email Security Appliance could allow an unauthenticated, remote attacker to cause an affected device to run out of memory and stop scanning and forwarding email messages. When system memory is depleted, it can cause the filtering process to crash, resulting in a denial of service (DoS) condition on the device.

The vulnerability is due to improper input validation of email attachments that contain corrupted fields. An attacker could exploit this vulnerability by sending an email message with an attachment that contains corrupted fields through a targeted device. When the affected software filters the attachment, the filtering process could crash when the system runs out of memory and the process restarts, resulting in a DoS condition. After the filtering process restarts, the software resumes filtering for the same attachment, causing the filtering process to crash and restart again. A successful exploit could allow the attacker to cause a repeated 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170920-esa ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170920-esa"]


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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Os 7

Nessus® Vulnerability Scanner

Date Description
2017-09-25 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20170920-esa-email_security_appliance.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2017-10-04 00:25:34
  • Multiple Updates
2017-09-26 13:24:57
  • Multiple Updates
2017-09-21 17:22:16
  • First insertion