Is CVE-2017-3793 being actively exploited?

CVE-2017-3793 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2017-3793?

CVE-2017-3793 has a CVSS 3.0 base score of 4.0 (MEDIUM).

CVE-2017-3793

MEDIUM · CVSS 4.0EPSS 1.7%EU EUVD

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.

Key facts

CVSS score: 4.0 (v3.0)
Severity: MEDIUM
CVSS vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
Weakness (CWE): CWE-399
EPSS score: 1.7% (77th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2017-12910)
Published: April 20, 2017
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-12910 in the EU Vulnerability Database. Last updated in EUVD on August 5, 2024.

View on the EU Vulnerability Database

Affected products

cisco / adaptive security appliance software
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and 203 more…

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Cisco Adaptive Security Appliances Version: ASA software version 9.1(2) Components: ASA 5500 (5505, 5510, 5520, 5540, 5550, 5580-20-40), ASA 5500-X Series (5512-X, 5515-X, 5525-X, 5545-X, 5555-X), ASA 5585-X (5585-10, 5585-20, 5585-40, 5585-60), ASA Services Module (ASA-SM) - Cisco Systems, Inc. - Common Criteria Certificate Number: 2013/86 - archived

References

http://www.securityfocus.com/bid/97923(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1038329
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-asa-norm(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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