No exploitation reported

CVE-2016-6458

No exploitation reported by the sources we read.

Published2016-11-19
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 content filtering functionality of Cisco AsyncOS Software for Cisco Email Security Appliances could allow an unauthenticated, remote attacker to bypass content filters configured on an affected device. Email that should have been filtered could instead be forwarded by the device. 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 use a content filter for email attachments that are protected or encrypted. More Information: CSCva52546. Known Affected Releases: 10.0.0-125 9.7.1-066.

Timeline

dates in UTC

2016-11-1903:03CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2016-6458?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-6458?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 firmware

Branch	Affected	Fixed in	Source
9.7	= 9.7.1-066	no fix published	NVD
9.7	= 9.7.2-046	no fix published	NVD
9.7	= 9.7.2-047	no fix published	NVD
9.7	= 9.7.2-054	no fix published	NVD
9.9	= 9.9.6-026	no fix published	NVD
9.9	= 9.9_base	no fix published	NVD
10.0	= 10.0.0-124	no fix published	NVD
10.0	= 10.0.0-125	no fix published	NVD

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

Fix

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score2.2 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2016-11-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-6458?

Is CVE-2016-6458 actively exploited?

Active exploitation of CVE-2016-6458 has not been confirmed. Its EPSS score was 2.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-6458?

CVE-2016-6458 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:N/I:H/A:N.

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