CVE-2018-15454

Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software Denial of Service Vulnerability

HIGH

8.6

CVSS Score

Published: November 1, 2018 at 01:00 PM UTC

Updated: August 11, 2026 at 07:33 PM UTC

2 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat Defense

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Severity

HIGH8.6

Exploit prediction

EPSS 4%

SSVC

No known exploit

Description

A vulnerability in the Session Initiation Protocol (SIP) inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload or trigger high CPU, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of SIP traffic. An attacker could exploit this vulnerability by sending SIP requests designed to specifically trigger this issue at a high rate across an affected device. Software updates that address this vulnerability are not yet available.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Adaptive Security Appliance · Cisco

95%

9.10 ≤ v < 9.10.1.29.4 ≤ v < 9.4.4.279.6 ≤ v < 9.6.4.189.8 ≤ v < 9.8.3.169.9 ≤ v < 9.9.2.329.4

Affected range stops below 9.10.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.4.4.27, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.6.4.18, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.8.3.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.9.2.32, so it looks safe — our inference, not a vendor statement

Secure Firewall Threat Defense · Cisco

95%

6.1.0 ≤ v < 6.1.0.76.2.0 ≤ v < 6.2.0.66.2.2 ≤ v < 6.2.2.46.2.3 ≤ v < 6.2.3.7

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos

References (3)

VDB Entryx_refsource_BIDThird Party Advisory

Source: [email protected]

http://www.securityfocus.com/bid/105768

VDB Entryx_refsource_SECTRACKThird Party Advisory

Source: [email protected]

http://www.securitytracker.com/id/1042129

Vendor Advisoryx_refsource_CISCOMitigation

Source: [email protected]

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGHcisco

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-20

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