How severe is CVE-2016-1381?

CVE-2016-1381 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-2016-1381 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-2016-1381?

CVE-2016-1381 primarily affects Cisco Web Security Appliance. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1381?

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-2016-1381 published?

CVE-2016-1381 was published on 2016-05-25 and last updated on 2026-06-17.

CVE-2016-1381

CVE-2016-1381 is a high-severity vulnerability in Cisco Web Security Appliance 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
Published: 2016-05-25
Last modified: 2026-06-17

Description

Memory leak in Cisco AsyncOS 8.5 through 9.0 before 9.0.1-162 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (memory consumption) via an HTTP file-range request for cached content, aka Bug ID CSCuw97270.

Frequently asked questions

What is CVE-2016-1381?: Memory leak in Cisco AsyncOS 8.5 through 9.0 before 9.0.1-162 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (memory consumption) via an HTTP file-range request for cached content, aka Bug ID CSCuw97270.
How severe is CVE-2016-1381?: CVE-2016-1381 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-2016-1381 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-2016-1381?: CVE-2016-1381 primarily affects Cisco Web Security Appliance. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1381?: 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-2016-1381 published?: CVE-2016-1381 was published on 2016-05-25 and last updated on 2026-06-17.

References

Affected products (10)

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: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_base:*:*:*:*:*:*:*

More vulnerabilities in Cisco Web Security Appliance

CVE-2023-20032 — Critical (CVSS 9.8): On Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed: A vulnerability in the…
CVE-2015-6298 — Critical (CVSS 9.0): The admin web interface in Cisco AsyncOS 8.x before 8.0.8-113, 8.1.x and 8.5.x before 8.5.3-051, 8.6.x and 8.7.x before…
CVE-2019-15956 — High (CVSS 8.8): A vulnerability in the web management interface of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could…
CVE-2019-1886 — High (CVSS 8.6): A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated,…
CVE-2018-0410 — High (CVSS 8.6): A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliances could allow…
CVE-2019-1816 — High (CVSS 7.8): A vulnerability in the log subscription subsystem of the Cisco Web Security Appliance (WSA) could allow an…

All CVEs affecting Cisco Web Security Appliance →

Other CWE-399 (Resource Management Errors) vulnerabilities

CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
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…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →