CVE-2016-6356
Summary
| CVE | CVE-2016-6356 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2016-10-28 10:59:06 UTC |
| Updated | 2026-05-06 22:30:45 UTC |
| Description | A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliances could allow an unauthenticated, remote attacker to cause an affected device to stop scanning and forwarding email messages due to a denial of service (DoS) condition. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco Email Security Appliances, both virtual and hardware appliances, if the software is configured to apply a message filter or content filter to incoming email attachments. The vulnerability is not limited to any specific rules or actions for a message filter or content filter. More Information: CSCuz63143. Known Affected Releases: 8.5.7-042 9.7.0-125. Known Fixed Releases: 10.0.0-125 9.1.1-038 9.7.2-047. |
Risk And Classification
Primary CVSS: v3.0 7.5 HIGH from [email protected]
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.007600000 probability, percentile 0.734680000 (date 2026-05-09)
Problem Types: CWE-20 | unspecified
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.0 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 2.0 | [email protected] | Primary | 7.8 | AV:N/AC:L/Au:N/C:N/I:N/A:C |
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
LowAuthentication
NoneConfidentiality
NoneIntegrity
NoneAvailability
CompleteAV:N/AC:L/Au:N/C:N/I:N/A:C
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Cisco | Email Security Appliance | 3.3.1-09 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.1.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.1.1 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.1.2 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.1.3 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.1.4 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.1.5 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.3.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.3.1 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.3.2 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.5.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.5.1 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.5.2 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.5.2-201 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.6.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.6.1-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.6.1-gpl-022 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.6.2 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.6.3-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.6.3-025 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.7.0-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.7.1-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.8.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 7.8.0-311 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.0.1-023 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.0_base | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.0-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.0-er1-198 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.6-052 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.6-073 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.6-074 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.6-106 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.6-113 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.5.7-042 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.6.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.6.0-011 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.9.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.9.1-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 8.9.2-032 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.0.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.0.0-212 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.0.0-461 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.0.5-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.1.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.1.0-011 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.1.0-032 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.1.0-101 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.4.0 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.4.4-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.5.0-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.5.0-201 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.6.0-000 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.6.0-042 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.6.0-051 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.7.0-125 | All | All | All |
| Application | Cisco | Email Security Appliance | 9.7.1-066 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Na | Cisco AsyncOS Through 9.7.0-125 | affected Cisco AsyncOS through 9.7.0-125 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Cisco Email Security Appliance Corrupted Attachment Fields Denial of Service Vulnerability | af854a3a-2127-422b-91ae-364da2661108 | tools.cisco.com | Vendor Advisory |
| Cisco AsyncOS CVE-2016-6356 Remote Denial of Service Vulnerability | af854a3a-2127-422b-91ae-364da2661108 | www.securityfocus.com | |
| Cisco Email Security Appliance Bug in Processing Corrupted Attachments Lets Remote Users Cause the Target System to Stop Processing Messages - SecurityTracker | af854a3a-2127-422b-91ae-364da2661108 | www.securitytracker.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.