Vulnerability Monitor

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CVE-2020-3120

A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing check when the affected software processes Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to exhaust system memory, causing the device to reload. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it requires adjacent network access with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 144 products from cisco, from cisco, from cisco and 141 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-02-05T18:15:11.063

Last Modified

2024-11-21T05:30:22.057

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

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

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

Exploitability Score

6.5

Impact Score

6.9

Weaknesses

Type: Secondary
CWE-190
Type: Primary
CWE-190

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cisco	firepower_extensible_operating_system	≤ 2.3.1.173	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.6.1.187	Yes
Operating System	cisco	firepower_extensible_operating_system	< 2.7.1.106	Yes
Operating System	cisco	fxos	2.4	Yes
Hardware	cisco	firepower_4110	-	No
Hardware	cisco	firepower_4115	-	No
Hardware	cisco	firepower_4120	-	No
Hardware	cisco	firepower_4125	-	No
Hardware	cisco	firepower_4140	-	No
Hardware	cisco	firepower_4145	-	No
Hardware	cisco	firepower_4150	-	No
Hardware	cisco	firepower_9300	-	No
Operating System	cisco	ios_xr	5.2.5	Yes
Hardware	cisco	ncs_6000	-	No
Operating System	cisco	ios_xr	6.4.2	Yes
Hardware	cisco	asr_9000v	-	No
Hardware	cisco	asr_9001	-	No
Hardware	cisco	asr_9006	-	No
Hardware	cisco	asr_9010	-	No
Hardware	cisco	asr_9901	-	No
Hardware	cisco	asr_9904	-	No
Hardware	cisco	asr_9906	-	No
Hardware	cisco	asr_9910	-	No
Hardware	cisco	asr_9912	-	No
Hardware	cisco	asr_9922	-	No
Hardware	cisco	crs	-	No
Operating System	cisco	ios_xr	6.5.3	Yes
Hardware	cisco	asr_9000v	-	No
Hardware	cisco	asr_9001	-	No
Hardware	cisco	asr_9006	-	No
Hardware	cisco	asr_9010	-	No
Hardware	cisco	asr_9901	-	No
Hardware	cisco	asr_9904	-	No
Hardware	cisco	asr_9906	-	No
Hardware	cisco	asr_9910	-	No
Hardware	cisco	asr_9912	-	No
Hardware	cisco	asr_9922	-	No
Hardware	cisco	ncs_5001	-	No
Hardware	cisco	ncs_5002	-	No
Hardware	cisco	ncs_5011	-	No
Hardware	cisco	ncs_540-12z20g-sys-a	-	No
Hardware	cisco	ncs_540-12z20g-sys-d	-	No
Hardware	cisco	ncs_540-24z8q2c-sys	-	No
Hardware	cisco	ncs_540-28z4c-sys-a	-	No
Hardware	cisco	ncs_540-28z4c-sys-d	-	No
Hardware	cisco	ncs_540-acc-sys	-	No
Hardware	cisco	ncs_540x-12z16g-sys-a	-	No
Hardware	cisco	ncs_540x-12z16g-sys-d	-	No
Hardware	cisco	ncs_540x-16z4g8q2c-a	-	No
Hardware	cisco	ncs_540x-16z4g8q2c-d	-	No
Hardware	cisco	ncs_540x-acc-sys	-	No
Hardware	cisco	ncs_5501	-	No
Hardware	cisco	ncs_5501-se	-	No
Hardware	cisco	ncs_5502	-	No
Hardware	cisco	ncs_5502-se	-	No
Hardware	cisco	ncs_5508	-	No
Hardware	cisco	ncs_5516	-	No
Hardware	cisco	ncs_560	-	No
Hardware	cisco	xrv_9000	-	No
Operating System	cisco	ios_xr	6.6.25	Yes
Hardware	cisco	ncs_560	-	No
Operating System	cisco	ios_xr	7.0.1	Yes
Hardware	cisco	ncs_540l	-	No
Operating System	cisco	nx-os	< 6.2\(29\)	Yes
Operating System	cisco	nx-os	< 8.4\(1a\)	Yes
Hardware	cisco	mds_9132t	-	No
Hardware	cisco	mds_9148s	-	No
Hardware	cisco	mds_9148t	-	No
Hardware	cisco	mds_9216	-	No
Hardware	cisco	mds_9216a	-	No
Hardware	cisco	mds_9216i	-	No
Hardware	cisco	mds_9222i	-	No
Hardware	cisco	mds_9506	-	No
Hardware	cisco	mds_9509	-	No
Hardware	cisco	mds_9513	-	No
Hardware	cisco	mds_9706	-	No
Hardware	cisco	mds_9710	-	No
Hardware	cisco	mds_9718	-	No
Operating System	cisco	nx-os	< 5.2\(1\)sv5\(1.3\)	Yes
Hardware	cisco	nexus_1000ve	-	No
Operating System	cisco	nx-os	≤ 5.2	Yes
Hardware	cisco	nexus_1000v	-	No
Operating System	cisco	nx-os	< 5.2\(1\)sv3\(4.1b\)	Yes
Hardware	cisco	nexus_1000v	-	No
Operating System	cisco	nx-os	< 9.3\(2\)	Yes
Operating System	cisco	nx-os	< 7.0\(3\)i7\(8\)	Yes
Hardware	cisco	nexus_3016	-	No
Hardware	cisco	nexus_3048	-	No
Hardware	cisco	nexus_3064	-	No
Hardware	cisco	nexus_3064-t	-	No
Hardware	cisco	nexus_31108pc-v	-	No
Hardware	cisco	nexus_31108tc-v	-	No
Hardware	cisco	nexus_31128pq	-	No
Hardware	cisco	nexus_3132c-z	-	No
Hardware	cisco	nexus_3132q	-	No
Hardware	cisco	nexus_3132q-v	-	No
Hardware	cisco	nexus_3132q-xl	-	No
Hardware	cisco	nexus_3164q	-	No
Hardware	cisco	nexus_3172	-	No
Hardware	cisco	nexus_3172pq-xl	-	No
Hardware	cisco	nexus_3172tq	-	No
Hardware	cisco	nexus_3172tq-32t	-	No
Hardware	cisco	nexus_3172tq-xl	-	No
Hardware	cisco	nexus_3232c_	-	No
Hardware	cisco	nexus_3264c-e	-	No
Hardware	cisco	nexus_3264q	-	No
Hardware	cisco	nexus_3408-s	-	No
Hardware	cisco	nexus_34180yc	-	No
Hardware	cisco	nexus_3432d-s	-	No
Hardware	cisco	nexus_3464c	-	No
Hardware	cisco	nexus_3524	-	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_36180yc-r	-	No
Hardware	cisco	nexus_3636c-r	-	No
Hardware	cisco	nexus_9000v	-	No
Hardware	cisco	nexus_92160yc-x	-	No
Hardware	cisco	nexus_92300yc	-	No
Hardware	cisco	nexus_92304qc	-	No
Hardware	cisco	nexus_92348gc-x	-	No
Hardware	cisco	nexus_9236c	-	No
Hardware	cisco	nexus_9272q	-	No
Hardware	cisco	nexus_93108tc-ex	-	No
Hardware	cisco	nexus_93108tc-fx	-	No
Hardware	cisco	nexus_93120tx	-	No
Hardware	cisco	nexus_93128tx	-	No
Hardware	cisco	nexus_93180lc-ex	-	No
Hardware	cisco	nexus_93180yc-ex	-	No
Hardware	cisco	nexus_93180yc-fx	-	No
Hardware	cisco	nexus_93216tc-fx2	-	No
Hardware	cisco	nexus_93240yc-fx2	-	No
Hardware	cisco	nexus_9332c	-	No
Hardware	cisco	nexus_9332pq	-	No
Hardware	cisco	nexus_93360yc-fx2	-	No
Hardware	cisco	nexus_9336c-fx2	-	No
Hardware	cisco	nexus_9336pq_aci_spine	-	No
Hardware	cisco	nexus_9348gc-fxp	-	No
Hardware	cisco	nexus_9364c	-	No
Hardware	cisco	nexus_9372px	-	No
Hardware	cisco	nexus_9372px-e	-	No
Hardware	cisco	nexus_9372tx	-	No
Hardware	cisco	nexus_9372tx-e	-	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
Operating System	cisco	nx-os	< 7.3\(6\)n1\(1\)	Yes
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	< 6.2\(24\)	Yes
Operating System	cisco	nx-os	< 7.3\(5\)d1\(1\)	Yes
Operating System	cisco	nx-os	< 8.2\(5\)	Yes
Operating System	cisco	nx-os	< 8.4\(2\)	Yes
Hardware	cisco	nexus_7000	-	No
Hardware	cisco	nexus_7700	-	No
Operating System	cisco	nx-os	< 13.2\(9b\)	Yes
Operating System	cisco	nx-os	< 14.2\(1j\)	Yes
Hardware	cisco	nexus_9000v	-	No
Hardware	cisco	nexus_92160yc-x	-	No
Hardware	cisco	nexus_92300yc	-	No
Hardware	cisco	nexus_92304qc	-	No
Hardware	cisco	nexus_92348gc-x	-	No
Hardware	cisco	nexus_9236c	-	No
Hardware	cisco	nexus_9272q	-	No
Hardware	cisco	nexus_93108tc-ex	-	No
Hardware	cisco	nexus_93108tc-fx	-	No
Hardware	cisco	nexus_93120tx	-	No
Hardware	cisco	nexus_93128tx	-	No
Hardware	cisco	nexus_93180lc-ex	-	No
Hardware	cisco	nexus_93180yc-ex	-	No
Hardware	cisco	nexus_93180yc-fx	-	No
Hardware	cisco	nexus_93216tc-fx2	-	No
Hardware	cisco	nexus_93240yc-fx2	-	No
Hardware	cisco	nexus_9332c	-	No
Hardware	cisco	nexus_9332pq	-	No
Hardware	cisco	nexus_93360yc-fx2	-	No
Hardware	cisco	nexus_9336c-fx2	-	No
Hardware	cisco	nexus_9336pq_aci_spine	-	No
Hardware	cisco	nexus_9348gc-fxp	-	No
Hardware	cisco	nexus_9364c	-	No
Hardware	cisco	nexus_9372px	-	No
Hardware	cisco	nexus_9372px-e	-	No
Hardware	cisco	nexus_9372tx	-	No
Hardware	cisco	nexus_9372tx-e	-	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
Application	cisco	ucs_manager	< 3.2\(3m\)	Yes
Application	cisco	ucs_manager	< 4.0\(4g\)	Yes
Hardware	cisco	ucs_6248up	-	No
Hardware	cisco	ucs_6296up	-	No
Hardware	cisco	ucs_6300	-	No
Hardware	cisco	ucs_6324	-	No
Hardware	cisco	ucs_64108	-	No
Hardware	cisco	ucs_6454	-	No

References

http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html Third Party Advisory, VDB Entry ([email protected])
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-fxnxos-iosxr-cdp-dos Vendor Advisory ([email protected])
http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-fxnxos-iosxr-cdp-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.