Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-1590— Cisco NX-OS Software system login block-for Denial of Service 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 NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco NX-OS Software 存在安全漏洞，攻击者利用该漏洞导致受影响设备拒绝服务。

CVSS 5.3 · Medium EPSS 1.35% · P71

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-1590

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Cisco NX-OS Software system login block-for Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the implementation of the system login block-for command for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a login process to unexpectedly restart, causing a denial of service (DoS) condition. This vulnerability is due to a logic error in the implementation of the system login block-for command when an attack is detected and acted upon. An attacker could exploit this vulnerability by performing a brute-force login attack on an affected device. A successful exploit could allow the attacker to cause a login process to reload, which could result in a delay during authentication to the affected device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco NX-OS Software 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco NX-OS Software 存在安全漏洞，攻击者利用该漏洞导致受影响设备拒绝服务。
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-2021-1590

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-1590

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-1590 (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-2021-1591 5.8 MEDIUM Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability
CVE-2021-1582 5.4 MEDIUM Cisco Application Policy Infrastructure Controller Stored Cross-Site Scripting Vulnerabili
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-787

V. Comments for CVE-2021-1590

No comments yet

Leave a comment