CVE-2016-6366

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Summary

CVECVE-2016-6366
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-08-18 18:59:00 UTC
Updated2026-04-22 15:42:51 UTC
DescriptionBuffer overflow in Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3 on ASA 5500, ASA 5500-X, ASA Services Module, ASA 1000V, ASAv, Firepower 9300 ASA Security Module, PIX, and FWSM devices allows remote authenticated users to execute arbitrary code via crafted IPv4 SNMP packets, aka Bug ID CSCva92151 or EXTRABACON.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.913890000 probability, percentile 0.996660000 (date 2026-04-22)

CISA KEV: Listed on 2022-05-24; due 2022-06-14; ransomware use Unknown

Problem Types: CWE-120 | n/a | CWE-120 CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary8.5AV:N/AC:M/Au:S/C:C/I:C/A:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:M/Au:S/C:C/I:C/A:C

CISA Known Exploited Vulnerability

VendorCisco
ProductAdaptive Security Appliance (ASA)
NameCisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://nvd.nist.gov/vuln/detail/CVE-2016-6366

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Cisco Adaptive Security Appliance Software All All All All
Hardware Cisco Pix Firewall 501 - All All All
Hardware Cisco Pix Firewall 506 - All All All
Hardware Cisco Pix Firewall 506e - All All All
Hardware Cisco Pix Firewall 515 - All All All
Hardware Cisco Pix Firewall 515e - All All All
Hardware Cisco Pix Firewall 520 - All All All
Hardware Cisco Pix Firewall 525 - All All All
Hardware Cisco Pix Firewall 535 - All All All
Operating System Cisco Pix Firewall Software - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Cisco ASA SNMP Buffer Overflow Lets Remote Users Deny Service or Execute Arbitrary Code - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Broken Link, Third Party Advisory, VDB Entry
Cisco Adaptive Security Appliance Products CVE-2016-6366 Buffer Overflow Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Broken Link, Not Applicable, Third Party Advisory, VDB Entry
Cisco ASA 8.x - 'EXTRABACON' Authentication Bypass - Hardware remote Exploit af854a3a-2127-422b-91ae-364da2661108 www.exploit-db.com Third Party Advisory, VDB Entry
Page not found · GitHub · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Broken Link, Exploit
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
zerosum0x0: Reverse Engineering Cisco ASA for EXTRABACON Offsets af854a3a-2127-422b-91ae-364da2661108 zerosum0x0.blogspot.com Exploit, Technical Description
Cisco Adaptive Security Appliance SNMP Remote Code Execution Vulnerability af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com Vendor Advisory
The Shadow Brokers EPICBANANA and EXTRABACON Exploits af854a3a-2127-422b-91ae-364da2661108 blogs.cisco.com Exploit, Press/Media Coverage, Vendor Advisory
Cisco Event Response: Cisco ASA and IOS Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev
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