LiveActive security incident?Get immediate response
CVE Record

CVE-2017-3818: A vulnerability in the Multipurpose Internet Mail Extensions (MIME) scanner of Cisco AsyncOS Software for C...

A vulnerability in the Multipurpose Internet Mail Extensions (MIME) scanner of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to bypass configured user filters on the device, aka a Malformed MIME Header Filtering Bypass. 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. More Information: CSCvb65245. Known Affected Releases: 9.7.1-066. Known Fixed Releases: 9.8.0-092.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysis

Security readout for executives and security teams

Cisco Email Security Appliances running affected AsyncOS versions may fail to apply configured attachment filters when handling malformed MIME headers. This can let unwanted or risky email attachments bypass policy controls, weakening a key email security layer without requiring authentication. Exposure is limited to Cisco ESA deployments running affected AsyncOS releases and configured to filter incoming email attachments. The source bundle identifies known affected release 9.7.1-066 and known fixed release 9.8.0-092. Treat as a priority for organizations relying on Cisco ESA attachment filtering for malware, DLP, or compliance controls. It is not KEV-listed in the bundle, but exposed mail gateways should be remediated during the next security maintenance window. Mitigation focus: Upgrade affected ESA appliances to Cisco AsyncOS fixed release 9.8.0-092.; Review Cisco advisory CSCvb65245 for applicable fixed trains and deployment guidance.; Confirm attachment message filters and content filters remain enabled after upgrade..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2017-3818 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aCisco AsyncOS 9.7.1-066Cisco AsyncOS 9.7.1-066Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.