How severe is CVE-2016-1383?

CVE-2016-1383 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2016-1383 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1383?

CVE-2016-1383 primarily affects Cisco Web Security Appliance (wsa). In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1383?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-1383 published?

CVE-2016-1383 was published on 2016-05-25 and last updated on 2026-06-17.

CVE-2016-1383

CVE-2016-1383 is a high-severity vulnerability in Cisco Web Security Appliance (wsa) with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Web Security Appliance (wsa)
Published: 2016-05-25
Last modified: 2026-06-17

Description

Memory leak in Cisco AsyncOS through 8.8 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (memory consumption) via an unspecified HTTP status code, aka Bug ID CSCur28305.

Frequently asked questions

What is CVE-2016-1383?: Memory leak in Cisco AsyncOS through 8.8 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (memory consumption) via an unspecified HTTP status code, aka Bug ID CSCur28305.
How severe is CVE-2016-1383?: CVE-2016-1383 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2016-1383 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1383?: CVE-2016-1383 primarily affects Cisco Web Security Appliance (wsa). In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1383?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-1383 published?: CVE-2016-1383 was published on 2016-05-25 and last updated on 2026-06-17.

References

Affected products (27)

cpe:2.3:a:cisco:web_security_appliance_\(wsa\):5.6.0-623:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):6.0.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.1.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.1.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.5.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.5.0-825:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.5.1-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.5.2-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.7.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):7.7.1-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.0-000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.6-078:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.6-119:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.7-142:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.0.8-mr-113:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.5.0-497:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.5.0.000:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.5.1-021:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.5.2-024:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.5.2-027:*:*:*:*:*:*:*
cpe:2.3:a:cisco:web_security_appliance_\(wsa\):8.5.3-055:*:*:*:*:*:*:*

More vulnerabilities in Cisco Web Security Appliance (wsa)

CVE-2016-1382 — High (CVSS 7.5): Cisco AsyncOS before 8.5.3-069 and 8.6 through 8.8 on Web Security Appliance (WSA) devices mishandles memory allocation…

All CVEs affecting Cisco Web Security Appliance (wsa) →

Other CWE-399 (Resource Management Errors) vulnerabilities

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CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

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