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CVE-2021-1591— Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Nexus 9500 Series Switches是美国思科（Cisco）公司的系列交换机。 Cisco Nexus 9500 Series Switches 中存在安全漏洞，攻击者可以通过该漏洞获取敏感数据。

CVSS 5.8 · Medium EPSS 1.00% · P61
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I. Basic Information for CVE-2021-1591

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Nexus 9500 Series Switches 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Nexus 9500 Series Switches是美国思科（Cisco）公司的系列交换机。 Cisco Nexus 9500 Series Switches 中存在安全漏洞，攻击者可以通过该漏洞获取敏感数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco NX-OS Software n/a -

II. Public POCs for CVE-2021-1591

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III. Intelligence Information for CVE-2021-1591

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Vendor Advisories for CVE-2021-1591 (1)

Same Patch Batch · Cisco · 2021-08-25 · 15 CVEs total

CVE-2021-1577 9.1 CRITICAL Cisco Application Policy Infrastructure Controller Arbitrary File Read and Write Vulnerabi
CVE-2021-1578 8.8 HIGH Cisco Application Policy Infrastructure Controller Privilege Escalation Vulnerability
CVE-2021-1588 8.6 HIGH Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability
CVE-2021-1587 8.6 HIGH Cisco NX-OS Software VXLAN OAM (NGOAM) Denial of Service Vulnerability
CVE-2021-1586 8.6 HIGH Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Se
CVE-2021-1523 8.6 HIGH Cisco Nexus 9000 Series Fabric Switches ACI Mode Queue Wedge Denial of Service Vulnerabili
CVE-2021-1579 8.1 HIGH Cisco Application Policy Infrastructure Controller App Privilege Escalation Vulnerability
CVE-2021-1581 6.5 MEDIUM Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulne
CVE-2021-1580 6.5 MEDIUM Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulne
CVE-2021-1584 6.0 MEDIUM Cisco Nexus 9000 Series Fabric Switches ACI Mode Privilege Escalation Vulnerability
CVE-2021-1582 5.4 MEDIUM Cisco Application Policy Infrastructure Controller Stored Cross-Site Scripting Vulnerabili
CVE-2021-1590 5.3 MEDIUM Cisco NX-OS Software system login block-for Denial of Service Vulnerability
CVE-2021-1583 4.4 MEDIUM Cisco Nexus 9000 Series Fabric Switches ACI Mode Arbitrary File Read Vulnerability
CVE-2021-1592 4.3 MEDIUM Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability

IV. Related Vulnerabilities

Same product: Cisco NX-OS Software
Same vendor: Cisco
Same weakness: CWE-284

V. Comments for CVE-2021-1591

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