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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-40126— Cisco Umbrella Email Enumeration Vulnerability

Quick assessment

Affected
Cisco Cisco Umbrella Insights Virtual Appliance
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 Umbrella是美国思科（Cisco）公司的一套云安全平台。该平台能够预防网络钓鱼、恶意软件和勒索软件等网络威胁。 Cisco Umbrella 存在安全漏洞，该漏洞源于当系统中已经存在新地址时，当用户试图修改其电子邮件地址时，仪表板上出现一个过于描述性的错误消息。攻击者可利用该漏洞枚举系统中用户的电子邮件地址。

CVSS 4.3 · Medium EPSS 0.87% · P57
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-40126

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 Umbrella Email Enumeration Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the web-based dashboard of Cisco Umbrella could allow an authenticated, remote attacker to perform an email enumeration attack against the Umbrella infrastructure. This vulnerability is due to an overly descriptive error message on the dashboard that appears when a user attempts to modify their email address when the new address already exists in the system. An attacker could exploit this vulnerability by attempting to modify the user's email address. A successful exploit could allow the attacker to enumerate email addresses of users in the system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过自主产生的错误消息导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Umbrella 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Umbrella是美国思科（Cisco）公司的一套云安全平台。该平台能够预防网络钓鱼、恶意软件和勒索软件等网络威胁。 Cisco Umbrella 存在安全漏洞，该漏洞源于当系统中已经存在新地址时，当用户试图修改其电子邮件地址时，仪表板上出现一个过于描述性的错误消息。攻击者可利用该漏洞枚举系统中用户的电子邮件地址。
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 Umbrella Insights Virtual Appliance n/a -

II. Public POCs for CVE-2021-40126

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-40126

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-40126 (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-2021-1500 5.4 MEDIUM Cisco Webex Video Mesh Arbitrary Site Redirection Vulnerability
CVE-2021-34784 5.4 MEDIUM Cisco Prime Infrastructure and Evolved Programmable Network Manager Stored Cross-Site Scri
CVE-2021-40128 5.3 MEDIUM Cisco Webex Meetings Email Content Injection Vulnerability
CVE-2021-40127 5.3 MEDIUM Cisco Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Deni
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-2021-34701 4.3 MEDIUM Cisco Unified Communications Products Path Traversal Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Umbrella Insights Virtual Appliance
Same vendor: Cisco
Same weakness: CWE-210

V. Comments for CVE-2021-40126

No comments yet

Leave a comment