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CVE-2017-3793

UnknownEPSS 1.71%

Last modified

CVE-2017-3793 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software8.0.1.2
CiscoAdaptive Security Appliance Software8.0.2
CiscoAdaptive Security Appliance Software8.0.2.11
CiscoAdaptive Security Appliance Software8.0.2.15
CiscoAdaptive Security Appliance Software8.0.3
CiscoAdaptive Security Appliance Software8.0.3.6
CiscoAdaptive Security Appliance Software8.0.3.12
CiscoAdaptive Security Appliance Software8.0.3.19
CiscoAdaptive Security Appliance Software8.0.4
CiscoAdaptive Security Appliance Software8.0.4.3
CiscoAdaptive Security Appliance Software8.0.4.9
CiscoAdaptive Security Appliance Software8.0.4.16
CiscoAdaptive Security Appliance Software8.0.4.23
CiscoAdaptive Security Appliance Software8.0.4.25
CiscoAdaptive Security Appliance Software8.0.4.28
CiscoAdaptive Security Appliance Software8.0.4.31
CiscoAdaptive Security Appliance Software8.0.4.32
CiscoAdaptive Security Appliance Software8.0.4.33
CiscoAdaptive Security Appliance Software8.0.5
CiscoAdaptive Security Appliance Software8.0.5.20
CiscoAdaptive Security Appliance Software8.0.5.23
CiscoAdaptive Security Appliance Software8.0.5.25
CiscoAdaptive Security Appliance Software8.0.5.27
CiscoAdaptive Security Appliance Software8.0.5.28
CiscoAdaptive Security Appliance Software8.0.5.31
CiscoAdaptive Security Appliance Software8.1.0.104
CiscoAdaptive Security Appliance Software8.1.1
CiscoAdaptive Security Appliance Software8.1.1.6
CiscoAdaptive Security Appliance Software8.1.2
CiscoAdaptive Security Appliance Software8.1.2.13
CiscoAdaptive Security Appliance Software8.1.2.15
CiscoAdaptive Security Appliance Software8.1.2.16
CiscoAdaptive Security Appliance Software8.1.2.19
CiscoAdaptive Security Appliance Software8.1.2.23
CiscoAdaptive Security Appliance Software8.1.2.24
CiscoAdaptive Security Appliance Software8.1.2.49
CiscoAdaptive Security Appliance Software8.1.2.50
CiscoAdaptive Security Appliance Software8.1.2.55
CiscoAdaptive Security Appliance Software8.1.2.56
CiscoAdaptive Security Appliance Software8.2.0.45
CiscoAdaptive Security Appliance Software8.2.1
CiscoAdaptive Security Appliance Software8.2.1.11
CiscoAdaptive Security Appliance Software8.2.2
CiscoAdaptive Security Appliance Software8.2.2.9
CiscoAdaptive Security Appliance Software8.2.2.10
CiscoAdaptive Security Appliance Software8.2.2.12
CiscoAdaptive Security Appliance Software8.2.2.16
CiscoAdaptive Security Appliance Software8.2.2.17
CiscoAdaptive Security Appliance Software8.2.3
CiscoAdaptive Security Appliance Software8.2.4

Showing 50 of 253 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 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.
How severe is CVE-2017-3793?
Severity scoring for CVE-2017-3793 is pending analysis. The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.
How do I fix CVE-2017-3793?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST