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No exploitation reported

CVE-2016-6372

No exploitation reported by the sources we read.

  • Published2016-10-28
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the email message and content filtering for malformed Multipurpose Internet Mail Extensions (MIME) headers of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) and Web Security Appliances (WSA) could allow an unauthenticated, remote attacker to bypass the filtering functionality of the targeted device. Emails that should have been quarantined could instead be processed. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco ESA and Cisco WSA on both virtual and hardware appliances that are configured with message or content filters to scan incoming email attachments. More Information: CSCuy54740, CSCuy75174. Known Affected Releases: 9.7.1-066 9.5.0-575 WSA10.0.0-000. Known Fixed Releases: 10.0.0-125 9.1.1-038 9.7.2-047.

Timeline

dates in UTC
  1. 2016-10-2810:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-6372?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-6372?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco email security appliance
BranchAffectedFixed in
8.0= 8.0.1-023no fix published
8.0= 8.0_baseno fix published
8.5= 8.5.0-000no fix published
8.5= 8.5.0-er1-198no fix published
8.5= 8.5.6-052no fix published
8.5= 8.5.6-073no fix published
8.5= 8.5.6-074no fix published
8.5= 8.5.6-106no fix published
8.5= 8.5.6-113no fix published
8.5= 8.5.7-042no fix published
8.6= 8.6.0no fix published
8.6= 8.6.0-011no fix published
Cisco web security appliance
BranchAffectedFixed in
5.6= 5.6.0-623no fix published
6.0= 6.0.0-000no fix published
7.1= 7.1.0no fix published
7.1= 7.1.1no fix published
7.1= 7.1.2no fix published
7.1= 7.1.3no fix published
7.1= 7.1.4no fix published
7.5= 7.5.0-000no fix published
7.5= 7.5.0-825no fix published
7.5= 7.5.1-000no fix published
7.5= 7.5.2-000no fix published
7.5= 7.5.2-hp2-303no fix published
Cisco web security appliance 8.0.5
BranchAffectedFixed in
—= hot_patch_1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.07.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2016-10-28
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2016-6372?

A vulnerability in the email message and content filtering for malformed Multipurpose Internet Mail Extensions (MIME) headers of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) and Web Security Appliances (WSA) could allow an unauthenticated, remote attacker to bypass the filtering functionality of the targeted device. Emails that should have been quarantined could instead be processed. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco ESA and Cisco WSA on both virtual and hardware appliances that are configured with message or content filters to scan incoming email attachments. More Information: CSCuy54740, CSCuy75174. Known Affected Releases: 9.7.1-066 9.5.0-575 WSA10.0.0-000. Known Fixed Releases: 10.0.0-125 9.1.1-038 9.7.2-047.

Is CVE-2016-6372 actively exploited?

Active exploitation of CVE-2016-6372 has not been confirmed. Its EPSS score was 1.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-6372?

CVE-2016-6372 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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