CVE-2018-15462

Cisco Firepower Threat Defense Software TCP Ingress Handler Denial of Service Vulnerability

HIGH
8.6
CVSS Score
Published: May 3, 2019 at 02:45 PM UTC
Updated: August 11, 2026 at 07:37 PM UTC
2 products affected across 1 vendorSecure Firewall Threat DefenseFirepower Threat Defense

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Severity
HIGH8.6
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the TCP ingress handler for the data interfaces that are configured with management access to Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an increase in CPU and memory usage, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient ingress TCP rate limiting for TCP ports 22 (SSH) and 443 (HTTPS). An attacker could exploit this vulnerability by sending a crafted, steady stream of TCP traffic to port 22 or 443 on the data interfaces that are configured with management access to the affected device.

Affected

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

v < 6.2.3.126.3.0 ≤ v < 6.3.0.3
v < 6.3.0.3
Affected range stops below 6.2.3.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

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-399CWE-770

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