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CVE-2026-20099Cisco UCS Manager and FXOS Software Command Injection Vulnerability

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.

Timeline

  1. ID reserved

    By cisco

  2. · 5 months later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-20099, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Deferred3.1Medium6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.74% · top 45% of all CVEs (15 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.7.

Affected products

  • Cisco · Cisco Firepower Extensible Operating System (FXOS)

    • affected 2.3.1.99
    • affected 2.3.1.56
    • affected 2.3.1.110
    • affected 2.3.1.58
    • affected 2.6.1.174
    • affected 2.6.1.157
    • affected 2.3.1.91
    • affected 2.3.1.73
    • affected 2.3.1.66
    • affected 2.6.1.166
    • affected 2.3.1.111
    • affected 2.3.1.166
    • affected 2.3.1.144
    • affected 2.6.1.131
    • affected 2.3.1.130
    • affected 2.3.1.88
    • affected 2.6.1.169
    • affected 2.3.1.75
    • affected 2.3.1.93
    • affected 2.3.1.145
    • affected 2.3.1.155
    • affected 2.6.1.187
    • affected 2.3.1.173
    • affected 2.3.1.179
    • affected 2.6.1.192
    • affected 2.3.1.180
    • affected 2.6.1.204
    • affected 2.6.1.214
    • affected 2.3.1.190
    • affected 2.6.1.224
    • affected 2.6.1.229
    • affected 2.3.1.215
    • affected 2.10.1.159
    • affected 2.3.1.216
    • affected 2.6.1.230
    • affected 2.10.1.166
    • affected 2.6.1.238
    • affected 2.6.1.239
    • affected 2.11.1.154
    • affected 2.10.1.179
    • and 43 more

  • Cisco · Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

    • affected 9.12.2
    • affected 9.12.1
    • affected 9.12.3
    • affected 9.12.4
    • affected 9.12.3.2
    • affected 9.12.3.12
    • affected 9.12.2.5
    • affected 9.12.1.2
    • affected 9.12.2.1
    • affected 9.12.3.7
    • affected 9.12.2.9
    • affected 9.12.3.9
    • affected 9.12.1.3
    • affected 9.12.4.2
    • affected 9.12.4.4
    • affected 9.12.4.7
    • affected 9.12.4.8
    • affected 9.12.4.10
    • affected 9.12.4.13
    • affected 9.12.4.18
    • affected 9.12.4.24
    • affected 9.16.1
    • affected 9.12.4.26
    • affected 9.16.1.28
    • affected 9.12.4.29
    • affected 9.16.2
    • affected 9.12.4.30
    • affected 9.16.2.3
    • affected 9.12.4.35
    • affected 9.16.2.7
    • affected 9.12.4.37
    • affected 9.17.1
    • affected 9.16.2.11
    • affected 9.16.2.13
    • affected 9.12.4.39
    • affected 9.12.4.38
    • affected 9.16.2.14
    • affected 9.17.1.7
    • affected 9.12.4.40
    • affected 9.16.3.3
    • and 95 more

  • Cisco · Cisco Unified Computing System (Managed)

    • affected 4.0(4h)
    • affected 4.1(1a)
    • affected 4.0(1c)
    • affected 4.0(4a)
    • affected 4.0(1a)
    • affected 4.0(1d)
    • affected 4.1(1c)
    • affected 4.0(2a)
    • affected 4.0(4g)
    • affected 4.0(2e)
    • affected 4.0(4c)
    • affected 4.0(4f)
    • affected 4.0(1b)
    • affected 4.0(2b)
    • affected 4.0(2d)
    • affected 4.1(1b)
    • affected 4.0(4d)
    • affected 4.0(4e)
    • affected 4.0(4b)
    • affected 4.1(2a)
    • affected 4.1(1d)
    • affected 4.0(4i)
    • affected 4.1(1e)
    • affected 4.1(2b)
    • affected 4.0(4k)
    • affected 4.1(3a)
    • affected 4.1(3b)
    • affected 4.1(2c)
    • affected 4.0(4l)
    • affected 4.1(4a)
    • affected 4.1(3c)
    • affected 4.1(3d)
    • affected 4.2(1c)
    • affected 4.2(1d)
    • affected 4.0(4m)
    • affected 4.1(3e)
    • affected 4.2(1f)
    • affected 4.1(3f)
    • affected 4.2(1i)
    • affected 4.1(3h)
    • and 47 more

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-20099 badge
[![CVE-2026-20099](https://cveledger.app/badge/CVE-2026-20099.svg)](https://cveledger.app/cve/CVE-2026-20099)

Record last updated .