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CVE-2018-0395

Cisco FXOS and NX-OS Software Link Layer Discovery Protocol Denial of Service Vulnerability

HIGH
8.8
CVSS Score
Published: October 17, 2018 at 08:00 PM UTC
Updated: June 17, 2026 at 01:30 AM UTC
13 products affected across 1 vendorNx OSFirepower Extensible Operating SystemFirepower 9300

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

A vulnerability in the Link Layer Discovery Protocol (LLDP) implementation for Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition when the device unexpectedly reloads. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface on the targeted device. A successful exploit could allow the attacker to cause the switch to reload unexpectedly.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firepower Extensible Operating System· Cisco
95%
r231
cisco-firepower-9300 (environment)
Nx OS· Cisconpm
95%
v < 6.2(1)12.3(1e)3.2(3d)c6.0(4)6.1(3)s2r231
Affected range stops below 6.2(1), so it looks safe — our inference, not a vendor statement
cisco-firepower-9300 (environment) · cisco-nexus-7000-10-slot (environment) · cisco-nexus-7000-18-slot (environment) · cisco-nexus-7000-4-slot (environment) · cisco-nexus-7000-9-slot (environment) · cisco-nexus-7700-10-slot (environment) · cisco-nexus-7700-18-slot (environment) · cisco-nexus-7700-2-slot (environment) · cisco-nexus-7700-6-slot (environment) · cisco-ucs (environment)
Firepower 4100 Series Next-Generation Firewall· Cisco
60%
v < <2.3.1.58
Affected range stops below <2.3.1.58, so it looks safe — our inference, not a vendor statement
Firepower 9300· Ciscodevice
80%
All versions
Nexus 7000 10-slot· Ciscodevice
80%
All versions
Nexus 7000 18-slot· Ciscodevice
80%
All versions
Nexus 7000 4-Slot· Ciscodevice
80%
All versions
Nexus 7000 9-slot· Ciscodevice
80%
All versions
Nexus 7700 10-Slot· Ciscodevice
80%
All versions
Nexus 7700 18-Slot· Ciscodevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

VDB Entryx_refsource_BIDThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/105674
VDB Entryx_refsource_SECTRACKThird Party Advisory
Source: [email protected]
http://www.securitytracker.com/id/1041919
Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181017-fxnx-os-dos

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHcisco
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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