CVE-2021-1591

mediumPriorität · verfolgen · 21EPSS 0.010 · 63. PerzentilEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.00% (63rd) EPSS

CVSS 5 · medium

Is it mine?

16 products

Prüfe deine Angriffsfläche

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · bewertet 2026-10-26

A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

BehobenCisco NX-OS Software 10.1(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(4) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(5) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(5w) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(6) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(7) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco NX-OS Software 9.3(7k) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

5.8

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USAusnutzbarkeit 10 · Auswirkung 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USAusnutzbarkeit 3.9 · Auswirkung 1.4

v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · ENISA EU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · psirt@cisco.com USAusnutzbarkeit 3.9 · Auswirkung 1.4

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · Cisco PSIRT US

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-284USCWE-284USCWE-287US

betroffene Produkte (16)

Betroffene Produkte und Versionsbereiche.

Cisco NX-OS Software 10.1(1) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(3) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(4) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(5) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(5w) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(6) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(7) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco NX-OS Software 9.3(7k) when installed on Cisco Nexus 9000 Series Switchesalle Versionencisco_csafUS
Cisco Cisco NX-OS Software≤ n/aenisa_euvdEU
Cisco Systems Inc. NX-OS≤ 9.3(5w)fstec_bduRU
Cisco Systems Inc. NX-OS≤ 9.3(7k)fstec_bduRU
Cisco Systems Inc. NX-OS≤ 9.3(7)fstec_bduRU
Cisco Systems Inc. NX-OS≤ 10.1(1)fstec_bduRU
Cisco Systems Inc. NX-OS≤ 9.3(3)fstec_bduRU
Cisco Systems Inc. NX-OS9.3(4) → 9.3(6)fstec_bduRU
cisco nx-os= 9.3(4)nvdUScpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

cisco-sa-nexus-acl-vrvQYPVeCisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability2021-08-25csaf · cisco_csafUS
A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the August 2021 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2021 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74640"].

auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

veröffentlicht 2021-08-25geändert 2026-06-17

Referenzen (6)

Externe Belege — Patches, Meldungen, Analysen.

scry

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