Medium severity5.8NVD Advisory· Published Nov 8, 2018· Updated Jun 17, 2026

CVE-2018-15443

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Firepower System Softwarellm-fuzzy2 versions
(expand)+ 1 more
- (no CPE)
- cpe:2.3:a:cisco:firepower_system_software:-:*:*:*:*:*:*:*
Cisco Systems, Inc./Firepower Management Center (FMC) Softwarecpe-rescue
Range: n/a

Patches

Vulnerability mechanics

References

www.securityfocus.com/bid/105870nvdThird Party AdvisoryVDB Entry
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181107-fde-tcp-bypassnvdVendor Advisory

News mentions

No linked articles in our index yet.

cvss	0.377
epss	0.002
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000