VDB-116873 · CVE-2018-0240 · BID 103934

Cisco ASA/Firepower Threat Defense Application Layer Protocol Inspection resource management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Cisco ASA and Firepower Threat Defense (Firewall Software) (affected version unknown). It has been rated as problematic. This issue affects an unknown functionality of the component Application Layer Protocol Inspection. The manipulation with an unknown input leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is availability. The summary by CVE is:

Multiple vulnerabilities in the Application Layer Protocol Inspection feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerabilities are due to logical errors during traffic inspection. An attacker could exploit these vulnerabilities by sending a high volume of malicious traffic across an affected device. An exploit could allow the attacker to cause a deadlock condition, resulting in a reload of an affected device. These vulnerabilities affect Cisco ASA Software and Cisco FTD Software configured for Application Layer Protocol Inspection running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCve61540, CSCvh23085, CSCvh95456.

The bug was discovered 04/18/2018. The weakness was presented 04/19/2018 as cisco-sa-20180418-asa_inspect as confirmed advisory (Website). The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2018-0240 since 11/27/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 109404 (Cisco ASA Multiple Vulnerabilities (cisco-sa-20180418-asa1 / cisco-sa-20180418-asa2 / cisco-sa-20180418-asa3 / cisco-sa-20180418-asaanyconnect / cisco-sa-20180418-asa_inspect)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316241 (Cisco Adaptive Security Appliance Application Layer Protocol Inspection Denial of Service Vulnerabilities(cisco-sa-20180418-asa_inspect)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (109404). See 116864, 116865, 116866 and 116868 for similar entries.






CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
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VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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NVD Base Score: 8.6
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Class: Resource management
CWE: CWE-399 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍


Nessus ID: 109404
Nessus Name: Cisco ASA Multiple Vulnerabilities (cisco-sa-20180418-asa1 / cisco-sa-20180418-asa2 / cisco-sa-20180418-asa3 / cisco-sa-20180418-asaanyconnect / cisco-sa-20180418-asa_inspect)
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Threat Intelligenceinfo

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Recommended: Upgrade
Status: 🔍

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11/27/2017 🔍
04/18/2018 +142 days 🔍
04/18/2018 +0 days 🔍
04/19/2018 +0 days 🔍
04/19/2018 +0 days 🔍
04/21/2018 +2 days 🔍
04/27/2018 +6 days 🔍
04/27/2018 +0 days 🔍
03/03/2023 +1771 days 🔍


Vendor: cisco.com

Advisory: cisco-sa-20180418-asa_inspect
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0240 (🔍)
SecurityTracker: 1040722
SecurityFocus: 103934 - Multiple Cisco Products CVE-2018-0240 Multiple Denial of Service Vulnerabilities

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Created: 04/21/2018 04:12 PM
Updated: 03/03/2023 02:08 PM
Changes: 04/21/2018 04:12 PM (72), 03/30/2020 04:08 PM (6), 03/03/2023 02:08 PM (4)
Complete: 🔍


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