CVE-2021-40126— Cisco Umbrella Email Enumeration Vulnerability
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I. Basic Information for CVE-2021-40126
Vulnerability Information
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Vulnerability Title
Cisco Umbrella Email Enumeration Vulnerability
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过自主产生的错误消息导致的信息暴露
Source: NVD (National Vulnerability Database)
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 |
|---|
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- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-user-enum-S7XfJwDEvendor-advisoryx_refsource_CISCO
- https://nvd.nist.gov/vuln/detail/CVE-2021-40126
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
- CVE-2022-20773
Cisco Umbrella Virtual Appliance Static SSH Host Key Vulnera - CVE-2022-20805
Cisco Umbrella Secure Web Gateway File Decryption Bypass Vul - CVE-2022-20738
Cisco Umbrella Secure Web Gateway File Inspection Bypass Vul - CVE-2021-1475
Cisco Umbrella Link and CSV Formula Injection Vulnerabilitie - CVE-2021-1474
Cisco Umbrella Link and CSV Formula Injection Vulnerabilitie
Same vendor: Cisco
- CVE-2026-20224
Cisco Catalyst SD-WAN Manager XML External Entity Injection - CVE-2026-20210
Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerabi - CVE-2026-20209
Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerabi - CVE-2026-20182
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulne - CVE-2026-20219
Cisco Slido 安全漏洞
V. Comments for CVE-2021-40126
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