CVE-2021-40120— Cisco Small Business RV Series Routers Command Injection Vulnerability
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I. Basic Information for CVE-2021-40120
Vulnerability Information
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Vulnerability Title
Cisco Small Business RV Series Routers Command Injection Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an authenticated, remote attacker with administrative privileges to inject arbitrary commands into the underlying operating system and execute them using root-level privileges. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending malicious input to a specific field in the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying Linux operating system as a user with root-level privileges.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco Small Business RV Series Routers 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Small Business RV Series Routers是美国思科（Cisco）公司的一款RV系列路由器。 Cisco Small Business RV Series Routers 存在操作系统命令注入漏洞，该漏洞源于基于 Web 的管理界面中存在一个漏洞，该漏洞可能允许具有管理权限的经过身份验证的远程攻击者将任意命令注入底层操作系统并使用root级别权限执行它们。
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 RV Series Router Firmware | n/a | - |
II. Public POCs for CVE-2021-40120
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbrv-cmdinjection-Z5cWFdKvendor-advisoryx_refsource_CISCO
- https://nvd.nist.gov/vuln/detail/CVE-2021-40120
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-2021-40115 | 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-2021-40126 | 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 RV Series Router Firmware
- CVE-2020-3431
Cisco Small Business RV Series Routers Cross-Site Scripting - CVE-2024-20524
Cisco Small Business RV042, RV042G, RV320, and RV325 Denial - CVE-2024-20523
Cisco Small Business RV042, RV042G, RV320, and RV325 Denial - CVE-2024-20522
Cisco Small Business RV042, RV042G, RV320, and RV325 Denial - CVE-2024-20521
Cisco Small Business RV042, RV042G, RV320, and RV325 Remote
Same vendor: Cisco
- CVE-2026-20219
Cisco Slido 安全漏洞 - CVE-2026-20034
Cisco Unity Connection Remote Code Execution Vulnerability - CVE-2026-20035
Cisco Unity Connection Server-Side Request Forgery Vulnerabi - CVE-2026-20167
Cisco IoT Field Network Director Remote Device Denial of Ser - CVE-2026-20169
Cisco IoT Field Network Director Command Injection Vulnerabi
Same weakness: CWE-20
V. Comments for CVE-2021-40120
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