Vulnerability Monitor

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CVE-2018-0303

A vulnerability in the Cisco Discovery Protocol component of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code as root or cause a denial of service (DoS) condition on the affected device. The vulnerability exists because of insufficiently validated Cisco Discovery Protocol packet headers. An attacker could exploit this vulnerability by sending a crafted Cisco Discovery Protocol packet to a Layer 2 adjacent affected device. A successful exploit could allow the attacker to cause a buffer overflow that could allow the attacker to execute arbitrary code as root or cause a DoS condition on the affected device. This vulnerability affects the following if configured to use Cisco Discovery Protocol: Firepower 4100 Series Next-Generation Firewalls, Firepower 9300 Security Appliance, MDS 9000 Series Multilayer Switches, Nexus 1000V Series Switches, Nexus 1100 Series Cloud Services Platforms, 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 Fabric Switches in Application Centric Infrastructure (ACI) mode, 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: CSCvc22202, CSCvc22205, CSCvc22208, CSCvc88078, CSCvc88150, CSCvc88159, CSCvc88162, CSCvc88167.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.8, indicating it requires adjacent network access with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 84 products from cisco, from cisco, from cisco and 81 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2018, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2018-06-21T11:29:00.413

Last Modified

2024-11-21T03:37:56.127

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 8.8 (HIGH)

CVSSv2 Vector

AV:A/AC:L/Au:N/C:C/I:C/A:C

Access Vector: ADJACENT_NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

6.5

Impact Score

10.0

Weaknesses

Type: Secondary
CWE-20
Type: Primary
CWE-119

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cisco	nx-os	7.0\(0\)hsk\(0.357\)	Yes
Operating System	cisco	nx-os	8.1\(0.2\)s0	Yes
Operating System	cisco	nx-os	8.8\(0.1\)	Yes
Hardware	cisco	nexus_5000	-	No
Hardware	cisco	nexus_5010	-	No
Hardware	cisco	nexus_5020	-	No
Hardware	cisco	nexus_5548p	-	No
Hardware	cisco	nexus_5548up	-	No
Hardware	cisco	nexus_5596t	-	No
Hardware	cisco	nexus_5596up	-	No
Hardware	cisco	nexus_56128p	-	No
Hardware	cisco	nexus_5624q	-	No
Hardware	cisco	nexus_5648q	-	No
Hardware	cisco	nexus_5672up	-	No
Hardware	cisco	nexus_5696q	-	No
Operating System	cisco	nx-os	8.0\(1\)	Yes
Hardware	cisco	nexus_7000	-	No
Hardware	cisco	nexus_7700	-	No
Operating System	cisco	nx-os	8.8\(3.5\)s0	Yes
Hardware	cisco	nexus_92160yc-x	-	No
Hardware	cisco	nexus_92304qc	-	No
Hardware	cisco	nexus_9236c	-	No
Hardware	cisco	nexus_9272q	-	No
Hardware	cisco	nexus_93108tc-ex	-	No
Hardware	cisco	nexus_93120tx	-	No
Hardware	cisco	nexus_93128tx	-	No
Hardware	cisco	nexus_93180yc-ex	-	No
Hardware	cisco	nexus_9332pq	-	No
Hardware	cisco	nexus_9372px	-	No
Hardware	cisco	nexus_9372tx	-	No
Hardware	cisco	nexus_9396px	-	No
Hardware	cisco	nexus_9396tx	-	No
Hardware	cisco	nexus_9504	-	No
Hardware	cisco	nexus_9508	-	No
Hardware	cisco	nexus_9516	-	No
Hardware	cisco	nexus_n9k-c9508-fm-r	-	No
Hardware	cisco	nexus_n9k-x9636c-r	-	No
Hardware	cisco	nexus_n9k-x9636q-r	-	No
Operating System	cisco	nx-os	7.0\(3\)i4\(7\)	Yes
Operating System	cisco	nx-os	7.0\(3\)i7\(1\)	Yes
Hardware	cisco	nexus_172tq-xl	-	No
Hardware	cisco	nexus_3016	-	No
Hardware	cisco	nexus_3048	-	No
Hardware	cisco	nexus_3064-32t	-	No
Hardware	cisco	nexus_3064-t	-	No
Hardware	cisco	nexus_3064-x	-	No
Hardware	cisco	nexus_3100-v	-	No
Hardware	cisco	nexus_31128pq	-	No
Hardware	cisco	nexus_3132c-z	-	No
Hardware	cisco	nexus_3132q	-	No
Hardware	cisco	nexus_3132q-x	-	No
Hardware	cisco	nexus_3132q-xl	-	No
Hardware	cisco	nexus_3164q	-	No
Hardware	cisco	nexus_3172pq	-	No
Hardware	cisco	nexus_3172pq-xl	-	No
Hardware	cisco	nexus_3172tq	-	No
Hardware	cisco	nexus_3172tq-32t	-	No
Hardware	cisco	nexus_3232c	-	No
Hardware	cisco	nexus_3264c-e	-	No
Hardware	cisco	nexus_3264q	-	No
Hardware	cisco	nexus_34180yc	-	No
Hardware	cisco	nexus_3524-x	-	No
Hardware	cisco	nexus_3524-xl	-	No
Hardware	cisco	nexus_3548	-	No
Hardware	cisco	nexus_3548-x	-	No
Hardware	cisco	nexus_3548-xl	-	No
Hardware	cisco	nexus_3636c-r	-	No
Hardware	cisco	nexus_c36180yc-r	-	No
Operating System	cisco	nx-os	7.0\(0\)hsk\(0.357\)	Yes
Operating System	cisco	nx-os	8.1\(0.2\)s0	Yes
Operating System	cisco	nx-os	8.8\(0.1\)	Yes
Hardware	cisco	nexus_2148t	-	No
Hardware	cisco	nexus_2224tp_ge	-	No
Hardware	cisco	nexus_2232pp_10ge	-	No
Hardware	cisco	nexus_2232tm-e_10ge	-	No
Hardware	cisco	nexus_2232tm_10ge	-	No
Hardware	cisco	nexus_2248pq_10ge	-	No
Hardware	cisco	nexus_2248tp-e	-	No
Hardware	cisco	nexus_2248tp_ge	-	No
Operating System	cisco	nx-os	7.0\(0\)hsk\(0.357\)	Yes
Operating System	cisco	nx-os	8.1\(0.2\)s0	Yes
Operating System	cisco	nx-os	8.8\(0.1\)	Yes
Hardware	cisco	nexus_6001p	-	No
Hardware	cisco	nexus_6001t	-	No
Operating System	cisco	nx-os	3.1\(3a\)a	Yes
Hardware	cisco	ucs_6120xp	-	No
Hardware	cisco	ucs_6140xp	-	No
Hardware	cisco	ucs_6248up	-	No
Hardware	cisco	ucs_6296up	-	No
Hardware	cisco	ucs_6324	-	No
Hardware	cisco	ucs_6332	-	No
Operating System	cisco	firepower_extensible_operating_system	< 1.1.4.179	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.0.1.153	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.1.1.86	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.2.1.70	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.2.2.17	Yes
Hardware	cisco	firepower_4110	-	No
Hardware	cisco	firepower_4120	-	No
Hardware	cisco	firepower_4140	-	No
Hardware	cisco	firepower_4150	-	No
Operating System	cisco	firepower_extensible_operating_system	< 1.1.4.179	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.0.1.153	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.1.1.86	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.2.1.70	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.2.2.17	Yes
Hardware	cisco	firepower_9300_security_appliance	-	No

References

http://www.securitytracker.com/id/1041169 Third Party Advisory, VDB Entry ([email protected])
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-fxnxos-dos Vendor Advisory ([email protected])
http://www.securitytracker.com/id/1041169 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-fxnxos-dos Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.