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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA TCP Normalizer Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1038329
SecurityTracker URL:
CVE Reference:   CVE-2017-3793   (Links to External Site)
Date:  Apr 20 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco ASA. A remote user can cause denial of service conditions on the target system.

The TCP normalizer does not properly limit the global out-of-order TCP queue for specific block sizes. A remote user can send a large number of specially crafted TCP connections with out-of-order segments to consume all available blocks in the global out-of-order TCP queue and cause the target device to drop all subsequent traffic on all interfaces.

The vendor has assigned bug ID CSCvb46321 to this vulnerability.

Impact:   A remote user can cause the system to drop all subsequent traffic on all interfaces.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Resource error

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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