Cisco ASA SNMP Packet Handling RCE (CSCva92151) (EXTRABACON)

high Nessus Plugin ID 93113


The remote device is missing a vendor-supplied security patch.


According to its banner and configuration, the version of the remote Cisco Adaptive Security Appliance (ASA) device is affected by a remote code execution vulnerability, known as EXTRABACON, in the Simple Network Management Protocol (SNMP) code due to a buffer overflow condition. An authenticated, remote attacker can exploit this, via specially crafted IPv4 SNMP packets, to cause a denial of service condition or the execution of arbitrary code. Note that an attacker must know the SNMP community string in order to exploit the vulnerability.

EXTRABACON is one of multiple Equation Group vulnerabilities and exploits disclosed on 2016/08/14 by a group known as the Shadow Brokers.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCva92151. Alternatively, as a workaround, change the SNMP community string, and only allow trusted users to have SNMP access.

Additionally, administrators can monitor affected systems using the 'snmp-server' host command.

See Also

Plugin Details

Severity: High

ID: 93113

File Name: cisco-sn-CSCva92151-asa.nasl

Version: 1.17

Type: local

Family: CISCO

Published: 8/25/2016

Updated: 4/25/2023

Supported Sensors: Nessus

Risk Information


Risk Factor: High

Score: 7.4


Risk Factor: High

Base Score: 8.5

Temporal Score: 7

Vector: CVSS2#AV:N/AC:M/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2016-6366


Risk Factor: High

Base Score: 8.8

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Host/Cisco/ASA

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/17/2016

Vulnerability Publication Date: 8/14/2016

CISA Known Exploited Vulnerability Due Dates: 6/14/2022

Exploitable With


Core Impact

Reference Information

CVE: CVE-2016-6366

BID: 92521

CISCO-SA: cisco-sa-20160817-asa-snmp