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CVE-2017-3793

4.0 · MEDIUM

A vulnerability in the TCP normalizer of Cisco Adaptive Security Appliance (ASA) Software (8.0 through 8.7 and 9.0 through 9.6) and Cisco Firepower Threat Defense (FTD) Software could allow an unau…

Published Apr 20, 2017CWE-399EPSS 1.71%

Overview

CVE-2017-3793 is a medium-severity vulnerability. It was published on April 20, 2017 and has a CVSS 3.0 base score of 4.0 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 4.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability in the TCP normalizer of Cisco Adaptive Security Appliance (ASA) Software (8.0 through 8.7 and 9.0 through 9.6) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause Cisco ASA and FTD to drop any further incoming traffic on all interfaces, resulting in a denial of service (DoS) condition. The vulnerability is due to improper limitation of the global out-of-order TCP queue for specific block sizes. An attacker could exploit this vulnerability by sending a large number of unique permitted TCP connections with out-of-order segments. An exploit could allow the attacker to exhaust available blocks in the global out-of-order TCP queue, causing the dropping of any further incoming traffic on all interfaces and resulting in a DoS condition. Cisco Bug IDs: CSCvb46321.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Refwww.securityfocus.com/bid/97923Refwww.securitytracker.com/id/1038329Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-asa-normRefwww.securityfocus.com/bid/97923Refwww.securitytracker.com/id/1038329Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-asa-norm

How CyberStrike helps

Frequently asked questions

What is CVE-2017-3793?

CVE-2017-3793 is a medium-severity vulnerability. It was published on April 20, 2017 and has a CVSS 3.0 base score of 4.0 (MEDIUM).

How severe is CVE-2017-3793?

This vulnerability has a CVSS 3.0 base score of 4.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-3793?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2017-3793?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-3793 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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