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CVE-2024-20399

63
FAUCET Score

CVE-2024-20399 is a command injection vulnerability in the CLI of Cisco NX-OS Software, affecting various Cisco Nexus switches. It allows an authenticated administrator to execute arbitrary commands as root on the underlying operating system due to insufficient validation of CLI command arguments. The vulnerability has a CVSS score of 6.7 (Medium) and requires Administrator credentials for exploitation, but grants root privileges, which is a significant escalation for devices where root access isn't already available via bash. This CVE is actively exploited (KEV listed), has garnered significant community discussion and media coverage, yet no public exploit code is currently available.

Impacted Technologies

VendorProductVersion(s)CPE
6.2\(2\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:6.2\(2\):*:*:*:*:*:*:*
6.2\(2a\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:6.2\(2a\):*:*:*:*:*:*:*
6.2\(6\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:6.2\(6\):*:*:*:*:*:*:*
6.2\(6a\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:6.2\(6a\):*:*:*:*:*:*:*
6.2\(6b\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:6.2\(6b\):*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.0MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
0.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.27%
Probability of exploitation in next 30 days
EPSS Percentile
90.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jul 2, 2024
This CVE's current EPSS score of 0.0427 is in the 100th percentile among its peer group of 3,720 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
sygnia.co / threat-reports-and-advisories/china-nexus-threat-group-velvet-ant-exploits-cisco-0-day
Third Party Advisory
sec.cloudapps.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cmd-injection-xD9OhyOP
Vendor Advisory