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CVE-2015-6321

7.8 · HIGH

Cisco AsyncOS before 8.5.7-042, 9.x before 9.1.0-032, 9.1.x before 9.1.1-023, and 9.5.x and 9.6.x before 9.6.0-042 on Email Security Appliance (ESA) devices; before 9.1.0-032, 9.1.1 before 9.1.1-00…

Published Nov 6, 2015ciscoCWE-399EPSS 2.76%

Overview

CVE-2015-6321 is a high-severity vulnerability affecting cisco web_security_appliance. It was published on November 6, 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 AsyncOS before 8.5.7-042, 9.x before 9.1.0-032, 9.1.x before 9.1.1-023, and 9.5.x and 9.6.x before 9.6.0-042 on Email Security Appliance (ESA) devices; before 9.1.0-032, 9.1.1 before 9.1.1-005, and 9.5.x before 9.5.0-025 on Content Security Management Appliance (SMA) devices; and before 7.7.0-725 and 8.x before 8.0.8-113 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (memory consumption) via a flood of TCP packets, aka Bug IDs CSCus79774, CSCus79777, and CSCzv95795.

Remediation

Check the references section for vendor advisories and patches from cisco. Update web_security_appliance 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-20151104-aosRefwww.securitytracker.com/id/1034060Refwww.securitytracker.com/id/1034061Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-aosRefwww.securitytracker.com/id/1034060Refwww.securitytracker.com/id/1034061

How CyberStrike helps

Frequently asked questions

What is CVE-2015-6321?

CVE-2015-6321 is a high-severity vulnerability affecting cisco web_security_appliance. It was published on November 6, 2015 and has a CVSS 2.0 base score of 7.8 (HIGH).

How severe is CVE-2015-6321?

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-2015-6321?

Check the references section for vendor advisories and patches from cisco. Update web_security_appliance 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-2015-6321?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-6321 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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