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CVE-2021-40127— Cisco Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Small Business Smart and Managed Switches
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 Small Business是美国思科（Cisco）公司的一个交换机。 Cisco Small Business 交换机 存在输入验证错误漏洞，该漏洞源于web管理页面对HTTP请求的验证不当造成的。攻击者可利用该漏洞通过向受影响的设备发送精心制作的HTTP请求导致dos。

CVSS 5.3 · Medium EPSS 1.28% · P69
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I. Basic Information for CVE-2021-40127

Vulnerability Information
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Vulnerability Title
Cisco Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the web-based management interface of Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Managed Switches, and Cisco Small Business 500 Series Stackable Managed Switches could allow an unauthenticated, remote attacker to render the web-based management interface unusable, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause a permanent invalid redirect for requests sent to the web-based management interface of the device, resulting in a DoS condition.
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
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Small Business 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Small Business是美国思科（Cisco）公司的一个交换机。 Cisco Small Business 交换机 存在输入验证错误漏洞，该漏洞源于web管理页面对HTTP请求的验证不当造成的。攻击者可利用该漏洞通过向受影响的设备发送精心制作的HTTP请求导致dos。
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 Small Business Smart and Managed Switches n/a -

II. Public POCs for CVE-2021-40127

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III. Intelligence Information for CVE-2021-40127

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Vendor Advisories for CVE-2021-40127 (1)

Same Patch Batch · Cisco · 2021-11-04 · 18 CVEs total

CVE-2021-34795 10.0 CRITICAL Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
CVE-2021-40112 10.0 CRITICAL Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
CVE-2021-40113 10.0 CRITICAL Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
CVE-2021-40119 9.8 CRITICAL Cisco Policy Suite Static SSH Keys Vulnerability
CVE-2021-34739 8.1 HIGH Cisco Small Business Series Switches Session Credentials Replay Vulnerability
CVE-2021-34741 7.5 HIGH Cisco Email Security Appliance Denial of Service Vulnerability
CVE-2021-40124 6.7 MEDIUM Cisco AnyConnect Secure Mobility Client for Windows with Network Access Manager Module Pri
CVE-2021-34773 6.5 MEDIUM Cisco Unified Communications Products Cross-Site Request Forgery Vulnerability
CVE-2021-40120 6.5 MEDIUM Cisco Small Business RV Series Routers Command Injection Vulnerability
CVE-2021-40115 6.1 MEDIUM Cisco Webex Video Mesh Cross-Site Scripting Vulnerability
CVE-2021-34784 5.4 MEDIUM Cisco Prime Infrastructure and Evolved Programmable Network Manager Stored Cross-Site Scri
CVE-2021-1500 5.4 MEDIUM Cisco Webex Video Mesh Arbitrary Site Redirection Vulnerability
CVE-2021-40128 5.3 MEDIUM Cisco Webex Meetings Email Content Injection Vulnerability
CVE-2021-34774 4.9 MEDIUM Cisco Common Services Platform Collector Information Disclosure Vulnerability
CVE-2021-34731 4.8 MEDIUM Cisco Prime Access Registrar Stored Cross-Site Scripting Vulnerability
CVE-2021-40126 4.3 MEDIUM Cisco Umbrella Email Enumeration Vulnerability
CVE-2021-34701 4.3 MEDIUM Cisco Unified Communications Products Path Traversal Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Small Business Smart and Managed Switches
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2021-40127

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