How severe is CVE-2016-1440?

CVE-2016-1440 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2016-1440 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1440?

CVE-2016-1440 primarily affects Cisco Web Security Appliance. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1440?

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

When was CVE-2016-1440 published?

CVE-2016-1440 was published on 2016-07-02 and last updated on 2026-06-17.

CVE-2016-1440

CVE-2016-1440 is a medium-severity vulnerability in Cisco Web Security Appliance with a CVSS 3.x base score of 5.3. 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-399.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Web Security Appliance
Published: 2016-07-02
Last modified: 2026-06-17

Description

The proxy process on Cisco Web Security Appliance (WSA) devices through 9.1.0-070 allows remote attackers to cause a denial of service (CPU consumption) by establishing an FTP session and then improperly terminating the control connection after a file transfer, aka Bug ID CSCuy43468.

Frequently asked questions

What is CVE-2016-1440?: The proxy process on Cisco Web Security Appliance (WSA) devices through 9.1.0-070 allows remote attackers to cause a denial of service (CPU consumption) by establishing an FTP session and then improperly terminating the control connection after a file transfer, aka Bug ID CSCuy43468.
How severe is CVE-2016-1440?: CVE-2016-1440 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2016-1440 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1440?: CVE-2016-1440 primarily affects Cisco Web Security Appliance. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1440?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-1440 published?: CVE-2016-1440 was published on 2016-07-02 and last updated on 2026-06-17.

References

Affected products (37)

cpe:2.3:a:cisco:web_security_appliance:5.6.0-623:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:6.0.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.1.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.1.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.5.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.5.0-825:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.5.1-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.5.2-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.5.2-hp2-303:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.7.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.7.0-608:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.7.1-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:7.7.5-835:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.5_hp1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.6-078:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.6-119:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.7-142:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.0.8-mr-113:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.5.0-497:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.5.0.000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.5.1-021:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.5.2-024:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.5.2-027:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.5.3-055:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.8.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:8.8.0-085:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.0.0-193:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.0_base:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.1.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance:9.1.0-070:*:*:*:*:*:*:*

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