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CVE-2017-3793

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…

Medium4.0EPSS 1.7%
Published
Updated
Reserved
Assigned by
cisco

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.

Scores

CVSS scores of CVE-2017-3793, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium4.0CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
EPSS (exploitation in 30 days)
1.7% · top 23% of all CVEs (3 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.0.

Weakness

Affected products

  • Cisco ASA Software and Cisco FTD Software

    • affected Cisco ASA Software and Cisco FTD Software

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .