CVE-2026-20321

mediumpriority · track · 26EPSS 0.004 · 37 %ileDENLRUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.43% (37th) EPSS
CVSS 6.5 · medium
Is it mine?
75 products
Check your exposure
Who says so?
4 sources
fstec_bdu · cert_bund · cisco_csaf · ncsc_nl

EPSS · scored 2026-10-22

A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

6.5
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nprimary · psirt@cisco.com USexploitability 1.2 · impact 5.2
v3.16.5mediumAV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU
v3.16mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · NCSC-NL NL
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-544USCWE-544USCWE-544US
05

affected products (75)

Products and version ranges known to be affected.

showing 20 of 75
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0409Kwetsbaarheden verholpen in Cisco APICNL2026-10-09csaf · ncsc_nlNL

    Cisco heeft meerdere kwetsbaarheden verholpen in Cisco Application Policy Infrastructure Controller (APIC).

  • WID-SEC-W-2026-3818Cisco Application Policy Infrastructure Controller: Mehrere SchwachstellenDeutsch2026-10-07csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Cisco Application Policy Infrastructure Controller ausnutzen, um sich erweiterte Berechtigungen zu verschaffen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

  • cisco-sa-apic-cmdinj-L6VR4E7Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability2026-10-07csaf · cisco_csafUS

    A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 7, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7"]. For further documentation of improvements and fixes in Cisco APIC, see Cisco Application Policy Infrastructure Controller Security Hardening Release: October 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7"].

07

also known as (1)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

fstec_bducert_bundcisco_csafncsc_nlNVDCVE.orgMITRE
published 2026-10-07modified 2026-10-13
09

references (1) nvd

External citations — patches, advisories, analysis.

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