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CVE-2018-15454

Affected software2 products, listed below
Severity8.6 High CVSS 3.0 3 scores
WeaknessImproper input validation (CWE-20)
Published1 Nov 2018
Updated11 Aug 2026

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.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.
  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. 1 citation · earliest 2018-10-31.
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 4.3% chance in 30 days

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2018-15454 in VulnCheck (free account).

EvidenceSourceDetailDate
Reported exploitation sec.cloudapps.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos 2018-10-31

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

8.6 HIGH v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.0 8.6 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H psirt@cisco.com Secondary published
CVSS 3.0 8.6 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H NVD Primary
CVSS 2.0 7.8 none AV:N/AC:L/Au:N/C:N/I:N/A:C NVD Primary

Affected software and releases

Products and versions

2 products, 9 version entries
SourceVendorProductSchemeAffected versions
nvd cisco adaptive security appliance software generic ≥ 9.4 and ＜ 9.4.4.27 · ≥ 9.6 and ＜ 9.6.4.18 · ≥ 9.8 and ＜ 9.8.3.16 · ≥ 9.9 and ＜ 9.9.2.32 · ≥ 9.10 and ＜ 9.10.1.2
nvd cisco secure firewall threat defense generic ≥ 6.1.0 and ＜ 6.1.0.7 · ≥ 6.2.0 and ＜ 6.2.0.6 · ≥ 6.2.2 and ＜ 6.2.2.4 · ≥ 6.2.3 and ＜ 6.2.3.7

References

URLTags
http://www.securityfocus.com/bid/105768 Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1042129 Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos Mitigation, Vendor Advisory

Timeline
VulnCheck KEV: earliest evidence2018-10-31Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
Published2018-11-01By the CVE Program.
NVD record modified2026-08-11NVD's own last-modified date for this record.