CVE-2018-0305

A vulnerability in the Cisco Fabric Services component of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. The vulnerability exists because the affected software insufficiently validates Cisco Fabric Services packets. An attacker could exploit this vulnerability by sending a crafted Cisco Fabric Services packet to an affected device. A successful exploit could allow the attacker to force a NULL pointer dereference and cause a DoS condition. This vulnerability affects the following if configured to use Cisco Fabric Services: Firepower 4100 Series Next-Generation Firewalls, Firepower 9300 Security Appliance, MDS 9000 Series Multilayer Switches, Nexus 2000 Series Fabric Extenders, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, UCS 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCvd69966, CSCve02435, CSCve04859, CSCve41590, CSCve41593, CSCve41601.

Published: 2018-06-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-0305 is rated Moderate Risk (64.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.32%). EPSS rose +1.69% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-0305

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.63% 2.32% +1.69%
2 2026-03-17 1.11% 0.63% -0.47%
3 2025-11-21 — 1.11% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-0305

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 4.0 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-0305

Affected software / configurations for CVE-2018-0305

Vendor Product Version Raw CPE
cisco nexus_7000_firmware 8.0\(1\) cpe:2.3:o:cisco:nexus_7000_firmware:8.0\(1\):*:*:*:*:*:*:*
cisco nexus_5000_firmware 7.0\(0\)hsk\(0.357\) cpe:2.3:o:cisco:nexus_5000_firmware:7.0\(0\)hsk\(0.357\):*:*:*:*:*:*:*
cisco nexus_5000_firmware 8.1\(0.2\)s0 cpe:2.3:o:cisco:nexus_5000_firmware:8.1\(0.2\)s0:*:*:*:*:*:*:*
cisco nexus_5000_firmware 8.8\(0.1\) cpe:2.3:o:cisco:nexus_5000_firmware:8.8\(0.1\):*:*:*:*:*:*:*
cisco firepower_9000_firmware r211 cpe:2.3:o:cisco:firepower_9000_firmware:r211:*:*:*:*:*:*:*
cisco firepower_9000_firmware r231 cpe:2.3:o:cisco:firepower_9000_firmware:r231:*:*:*:*:*:*:*
cisco nexus_9000_firmware 8.1\(0\)bd\(0.20\) cpe:2.3:o:cisco:nexus_9000_firmware:8.1\(0\)bd\(0.20\):*:*:*:*:*:*:*
cisco nexus_9000_firmware 8.1\(1\)s5 cpe:2.3:o:cisco:nexus_9000_firmware:8.1\(1\)s5:*:*:*:*:*:*:*
cisco unified_computing_system_firmware 3.1\(3a\)a cpe:2.3:o:cisco:unified_computing_system_firmware:3.1\(3a\)a:*:*:*:*:*:*:*
cisco unified_computing_system_firmware 7.0\(0\)hsk\(0.357\) cpe:2.3:o:cisco:unified_computing_system_firmware:7.0\(0\)hsk\(0.357\):*:*:*:*:*:*:*

References for CVE-2018-0305

cvelogic Threat Intelligence