Cisco Email Security Appliance prior 9.8.1-015/10.0.2-020 MIME Header input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

A vulnerability was found in Cisco Email Security Appliance (Anti-Malware Software). It has been classified as critical. Affected is an unknown code block of the component MIME Header Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-20. This is going to have an impact on confidentiality, integrity, and availability.

The bug was discovered 06/07/2017. The weakness was released 06/07/2017 by Cisco with Cisco as cisco-sa-20170607-esa1 as confirmed advisory (Website). The advisory is shared for download at This vulnerability is traded as CVE-2017-6671 since 03/09/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/26/2020).

The vulnerability scanner Nessus provides a plugin with the ID 101264 (Cisco AsyncOS for Email Security Appliance Attachment MIME Header Handling Filter Bypass (cisco-sa-20170607-esa1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context combined.

Upgrading to version 9.8.1-015 or 10.0.2-020 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 98969), SecurityTracker (ID 1038635) and Tenable (101264). Entry connected to this vulnerability is available at 102157.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Cisco): 5.8
Vendor Vector (Cisco): 🔍

NVD Base Score: 7.5
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Privilege escalation
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 101264
Nessus Name: Cisco AsyncOS for Email Security Appliance Attachment MIME Header Handling Filter Bypass (cisco-sa-20170607-esa1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103403
OpenVAS Name: Cisco Email Security Appliance Attachment Filter Bypass Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍


Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Email Security Appliance 9.8.1-015/10.0.2-020


03/09/2017 🔍
06/07/2017 +90 days 🔍
06/07/2017 +0 days 🔍
06/07/2017 +0 days 🔍
06/07/2017 +0 days 🔍
06/08/2017 +1 days 🔍
06/09/2017 +1 days 🔍
06/13/2017 +4 days 🔍
07/06/2017 +23 days 🔍
12/26/2020 +1269 days 🔍



Advisory: cisco-sa-20170607-esa1
Researcher: Cisco
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-6671 (🔍)
SecurityFocus: 98969 - Cisco AsyncOS Software CVE-2017-6671 Remote Security Bypass Vulnerability
SecurityTracker: 1038635

See also: 🔍


Created: 06/09/2017 09:26 AM
Updated: 12/26/2020 05:16 PM
Changes: (1) advisory_person_name
Complete: 🔍


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