No exploitation reported

CVE-2018-0455

No exploitation reported by the sources we read.

Published2018-10-05
WeaknessCWE-19

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the Server Message Block Version 2 (SMBv2) and Version 3 (SMBv3) protocol implementation for the Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause the device to run low on system memory, possibly preventing the device from forwarding traffic. It is also possible that a manual reload of the device may be required to clear the condition. The vulnerability is due to incorrect SMB header validation. An attacker could exploit this vulnerability by sending a custom SMB file transfer through the targeted device. A successful exploit could cause the device to consume an excessive amount of system memory and prevent the SNORT process from forwarding network traffic. This vulnerability can be exploited using either IPv4 or IPv6 in combination with SMBv2 or SMBv3 network traffic.

Timeline

dates in UTC

2018-10-0514:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-0455?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-0455?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco firepower system software

Branch	Affected	Fixed in	Source
6.0	= 6.0	no fix published	NVD
6.0	= 6.0.1	no fix published	NVD
6.1	= 6.1.0	no fix published	NVD
6.2	= 6.2.0	no fix published	NVD
6.2	= 6.2.0.2	no fix published	NVD
6.2	= 6.2.1	no fix published	NVD
6.2	= 6.2.2	no fix published	NVD
6.2	= 6.2.3	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-11-25
OpenCVESSVC decisionnone—
NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-19read 2026-10-23
FIRST EPSSEPSS score1.5 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2018-10-05
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-0455?

Is CVE-2018-0455 actively exploited?

Active exploitation of CVE-2018-0455 has not been confirmed. Its EPSS score was 1.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-0455?

CVE-2018-0455 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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