CVE-2018-15443 json
Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass Vulnerability
published 2018-11-08 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-7321
- cvss
- 5.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.8%
- EPSS 2.8% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction
2.77% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 5.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Cisco Cisco Firepower Management Center
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
tools.cisco.com
/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181107-fde-tcp-bypass
vendor-advisory
-
securityfocus.com
/bid/105870
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2018-15443
- NVD CVE-2018-15443
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