How severe is CVE-2016-6416?

CVE-2016-6416 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-6416 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6416?

CVE-2016-6416 primarily affects Cisco Content Security Management Appliance. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6416?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-6416 published?

CVE-2016-6416 was published on 2016-10-05 and last updated on 2026-06-17.

CVE-2016-6416

CVE-2016-6416 is a medium-severity vulnerability in Cisco Content Security Management Appliance with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Cisco Content Security Management Appliance
Published: 2016-10-05
Last modified: 2026-06-17

Description

The FTP service in Cisco AsyncOS on Email Security Appliance (ESA) devices 9.6.0-000 through 9.9.6-026, Web Security Appliance (WSA) devices 9.0.0-162 through 9.5.0-444, and Content Security Management Appliance (SMA) devices allows remote attackers to cause a denial of service via a flood of FTP traffic, aka Bug IDs CSCuz82907, CSCuz84330, and CSCuz86065.

Frequently asked questions

What is CVE-2016-6416?: The FTP service in Cisco AsyncOS on Email Security Appliance (ESA) devices 9.6.0-000 through 9.9.6-026, Web Security Appliance (WSA) devices 9.0.0-162 through 9.5.0-444, and Content Security Management Appliance (SMA) devices allows remote attackers to cause a denial of service via a flood of FTP traffic, aka Bug IDs CSCuz82907, CSCuz84330, and CSCuz86065.
How severe is CVE-2016-6416?: CVE-2016-6416 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-6416 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6416?: CVE-2016-6416 primarily affects Cisco Content Security Management Appliance. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6416?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-6416 published?: CVE-2016-6416 was published on 2016-10-05 and last updated on 2026-06-17.

References

Affected products (21)

cpe:2.3:a:cisco:content_security_management_appliance:9.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-004:*:*:*:*:*:*:*
cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-031:*:*:*:*:*:*:*
cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-033:*:*:*:*:*:*:*
cpe:2.3:a:cisco:content_security_management_appliance:9.1.0-103:*:*:*:*:*:*:*
cpe:2.3:a:cisco:content_security_management_appliance:9.5.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:content_security_management_appliance:9.6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:email_security_appliance:9.6.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:email_security_appliance:9.6.0-042:*:*:*:*:*:*:*
cpe:2.3:a:cisco:email_security_appliance:9.6.0-051:*:*:*:*:*:*:*
cpe:2.3:a:cisco:email_security_appliance:9.7.1-066:*:*:*:*:*:*:*
cpe:2.3:a:cisco:email_security_appliance:9.9.6-026:*:*:*:*:*:*:*
cpe:2.3:a:cisco:email_security_appliance:9.9_base:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.0.0-162:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.1.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.1.0-070:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.1_base:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.5.0-235:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.5.0-284:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.5.0-444:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.5_base:*:*:*:*:*:*:*

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →