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CVE-2021-20041

Quick assessment

Affected
SonicWall SonicWall SMA100
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sonicwall SMA100是美国Sonicwall公司的一款安全访问网关设备。 SonicWall SMA100 存在安全漏洞，该漏洞发送到 /fileshare/sonicfiles/sonicfiles 的精心制作的 HTTP 请求会导致无法访问退出条件的循环，因此未经身份验证的远程攻击者可能会消耗设备的所有 CPU。此漏洞影响了 SMA 200、210、400、410 和 500v 设备。

AI Predicted 7.5 Difficulty: Trivial EPSS 21.20% · P98

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-20041

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with unreachable exit condition. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
SonicWall SMA100安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sonicwall SMA100是美国Sonicwall公司的一款安全访问网关设备。 SonicWall SMA100 存在安全漏洞，该漏洞发送到 /fileshare/sonicfiles/sonicfiles 的精心制作的 HTTP 请求会导致无法访问退出条件的循环，因此未经身份验证的远程攻击者可能会消耗设备的所有 CPU。此漏洞影响了 SMA 200、210、400、410 和 500v 设备。
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
SonicWall SonicWall SMA100 9.0.0.11-31sv and earlier -

II. Public POCs for CVE-2021-20041

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III. Intelligence Information for CVE-2021-20041

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Other References for CVE-2021-20041 (1)

Same Patch Batch · SonicWall · 2021-12-08 · 9 CVEs total

CVE-2021-20047 SonicWall Global VPN client 代码问题漏洞
CVE-2021-20045 SonicWall SMA100 安全漏洞
CVE-2021-20044 Sonicwall SMA100 操作系统命令注入漏洞
CVE-2021-20043 Sonicwall SMA100 缓冲区错误漏洞
CVE-2021-20042 SonicWall SMA100 安全漏洞
CVE-2021-20040 Sonicwall SMA100 路径遍历漏洞
CVE-2021-20039 Sonicwall SMA100 操作系统操作系统命令注入漏洞
CVE-2021-20038 Sonicwall SMA100 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: SonicWall SMA100
Same vendor: SonicWall
Same weakness: CWE-835

V. Comments for CVE-2021-20041

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