How severe is CVE-2016-6437?

CVE-2016-6437 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-2016-6437 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6437?

CVE-2016-6437 primarily affects Cisco Wide Area Application Services. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6437?

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

When was CVE-2016-6437 published?

CVE-2016-6437 was published on 2016-10-27 and last updated on 2026-06-17.

CVE-2016-6437

CVE-2016-6437 is a medium-severity vulnerability in Cisco Wide Area Application Services 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-399.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 7.1
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Wide Area Application Services
Published: 2016-10-27
Last modified: 2026-06-17

Description

A vulnerability in the SSL session cache management of Cisco Wide Area Application Services (WAAS) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to high consumption of disk space. The user would see a performance degradation. More Information: CSCva03095. Known Affected Releases: 5.3(5), 6.1(1), 6.2(1). Known Fixed Releases: 5.3(5g)1, 6.2(2.32).

Frequently asked questions

What is CVE-2016-6437?: A vulnerability in the SSL session cache management of Cisco Wide Area Application Services (WAAS) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to high consumption of disk space. The user would see a performance degradation. More Information: CSCva03095. Known Affected Releases: 5.3(5), 6.1(1), 6.2(1). Known Fixed Releases: 5.3(5g)1, 6.2(2.32).
How severe is CVE-2016-6437?: CVE-2016-6437 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-2016-6437 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6437?: CVE-2016-6437 primarily affects Cisco Wide Area Application Services. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6437?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-6437 published?: CVE-2016-6437 was published on 2016-10-27 and last updated on 2026-06-17.

References

Affected products (13)

cpe:2.3:a:cisco:wide_area_application_services:5.3.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5b:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5c:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5d:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5e:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:5.3.5f:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:6.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:6.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:wide_area_application_services:6.2.1a:*:*:*:*:*:*:*

More vulnerabilities in Cisco Wide Area Application Services

CVE-2013-3443 — Critical (CVSS 10.0): The web service framework in Cisco WAAS Software 4.x and 5.x before 5.0.3e, 5.1.x before 5.1.1c, and 5.2.x before 5.2.1…
CVE-2014-2196 — Critical (CVSS 9.3): Cisco Wide Area Application Services (WAAS) 5.1.1 before 5.1.1e, when SharePoint prefetch optimization is enabled,…
CVE-2013-3444 — Critical (CVSS 9.0): The web framework in Cisco WAAS Software before 4.x and 5.x before 5.0.3e, 5.1.x before 5.1.1c, and 5.2.x before 5.2.1;…
CVE-2007-3923 — High (CVSS 7.8): The Common Internet File System (CIFS) optimization in Cisco Wide Area Application Services (WAAS) 4.0.7 and 4.0.9, as…
CVE-2015-6421 — High (CVSS 7.5): cifs-ao in the CIFS optimization functionality on Cisco Wide Area Application Service (WAAS) and Virtual WAAS (vWAAS)…
CVE-2017-6628 — Medium (CVSS 6.8): A vulnerability in SMART-SSL Accelerator functionality for Cisco Wide Area Application Services (WAAS) 6.2.1, 6.2.1a,…

All CVEs affecting Cisco Wide Area Application Services →

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 →