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CVE-2015-6391

7.8 · HIGH

Cisco Unified SIP 3905 phones allow remote attackers to cause a denial of service (resource consumption and functionality loss) via a large amount of network traffic, aka Bug ID CSCuh51331.

Published Dec 5, 2015ciscoCWE-399EPSS 1.91%

Overview

CVE-2015-6391 is a high-severity vulnerability affecting cisco unified_sip_phone_3900_firmware. It was published on December 5, 2015 and has a CVSS 2.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Cisco Unified SIP 3905 phones allow remote attackers to cause a denial of service (resource consumption and functionality loss) via a large amount of network traffic, aka Bug ID CSCuh51331.

Remediation

Check the references section for vendor advisories and patches from cisco. Update unified_sip_phone_3900_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151202-sipRefwww.securitytracker.com/id/1034285Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151202-sipRefwww.securitytracker.com/id/1034285

How CyberStrike helps

Frequently asked questions

What is CVE-2015-6391?

CVE-2015-6391 is a high-severity vulnerability affecting cisco unified_sip_phone_3900_firmware. It was published on December 5, 2015 and has a CVSS 2.0 base score of 7.8 (HIGH).

How severe is CVE-2015-6391?

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-6391?

Check the references section for vendor advisories and patches from cisco. Update unified_sip_phone_3900_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-6391?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-6391 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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