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ReviewHigh

CVE-2018-0228

Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense

A vulnerability in the ingress flow creation functionality of Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause the CPU to increase upwards of 100% utilization, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to incorrect handling of an internal software lock that could prevent other system processes from getting CPU cycles, causing a high CPU condition. An attacker could exploit this vulnerability by sending a steady stream of malicious IP packets that can cause connections to be created on the targe...

CVSS
8.6
EPSS
3.56%
88.5% percentile
CISA KEV
Not listed
Published
2018.04.20
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability3.56%
Technical severityCVSS 8.6

Vulnerability overview

A vulnerability in the ingress flow creation functionality of Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause the CPU to increase upwards of 100% utilization, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to incorrect handling of an internal software lock that could prevent other system processes from getting CPU cycles, causing a high CPU condition. An attacker could exploit this vulnerability by sending a steady stream of malicious IP packets that can cause connections to be created on the targe...

Affected product and versions

Product
Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense
Affected versions
>= Cisco Adaptive Security Appliance, >= 9.1 < 9.1.7.20, >= 9.3 < 9.4.4.13, >= 9.5 < 9.6.3.17, >= 9.7 < 9.7.1.16, >= 9.8 < 9.8.2.14, >= 9.2 < 9.2.4.27, >= 9.9 < 9.9.1, 98.1(12.187), >= 6.0 < 6.1.0.6, >= 6.2.0 < 6.2.0.5, >= 6.2.1 < 6.2.2.2
Fixed versions
9.1.7.20, 9.4.4.13, 9.6.3.17, 9.7.1.16, 9.8.2.14, 9.2.4.27, 9.9.1, 6.1.0.6, 6.2.0.5, 6.2.2.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
CWE-20, CWE-667