TI-2018-11003 Aliases CVE-2018-15443 GHSA-r3fv-hxw4-7fj4

Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass Vulnerability

MEDIUM 44CWE-400Published 2018-11-08 · Updated 2024-11-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-400.

Summary

A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass a configured Intrusion Prevention System (IPS) rule that inspects certain types of TCP traffic. The vulnerability is due to incorrect TCP retransmission handling. An attacker could exploit this vulnerability by sending a crafted TCP connection request through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.02767 86th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco Firepower Management Center	all versions	—	No fix listed	CNA

Cisco Firepower Management Center VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:firepower_system_software:-:::::::*	not specified by NVD	Vulnerable	Cisco

cpe:2.3:a:cisco:firepower_system_software:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2018-15443
2026-10-03 Alias added: GHSA-r3fv-hxw4-7fj4

References

Advisory 1

20181107 Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass Vulnerability

TI-2018-00414 Cisco Firepower System Software Detection Engine Denial of Service Vulnerability CVSS 3.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences