Medium severity · published Feb 25, 2026
CVE-2026-20099
Cisco UCS Manager and FXOS Software Command Injection Vulnerability
6.7
CVSS
0.7%
EPSS
No
On KEV
Description
A vulnerability in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software could allow an authenticated, local attacker with administrative privileges to perform command injection attacks on an affected system and elevate privileges to root.  This vulnerability is due to insufficient input validation of command arguments supplied by the user. An attacker could exploit this vulnerability by authenticating to a device and submitting crafted input to the affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of the affected device with root-level privileges.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CF
Cisco Firepower Extensible Operating System (FXOS) · Cisco
2.3.1.99; 2.3.1.56; 2.3.1.110; 2.3.1.58; 2.6.1.174; 2.6.1.157; +34 more · source: vendor
CS
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software · Cisco
9.12.2; 9.12.1; 9.12.3; 9.12.4; 9.12.3.2; 9.12.3.12; +34 more · source: vendor
CU
Cisco Unified Computing System (Managed) · Cisco
4.0(4h); 4.1(1a); 4.0(1c); 4.0(4a); 4.0(1a); 4.0(1d); +34 more · source: vendor
Affected product
CF
Cisco Firepower Extensible Operating System (FXOS)
Cisco
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