CVE-2020-3119 json
Cisco NX-OS Software Cisco Discovery Protocol Remote Code Execution Vulnerability
published 2020-02-05 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-24390
- cvss
- 8.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.8%
- EPSS 4.8% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
A vulnerability in the Cisco Discovery Protocol implementation for Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code or cause a reload on an affected device. The vulnerability exists because the Cisco Discovery Protocol parser does not properly validate input for certain fields in a Cisco Discovery Protocol message. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. An successful exploit could allow the attacker to cause a stack overflow, which could allow the attacker to execute arbitrary code with administrative privileges on an affected device. 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).
Patch / fix
- Cisco Cisco Unified Computing System (Managed) 9.3(2)
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 23 mo ago
Exploit prediction
4.78% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 8.8 | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 8.3 | AV:A/AC:L/Au:N/C:C/I:C/A:C |
Affected products
- Cisco Cisco Unified Computing System (Managed)
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
tools.cisco.com
/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-nxos-cdp-rce
vendor-advisory
-
packetstormsecurity.com
/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2020-3119
- NVD CVE-2020-3119
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