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CVE-2021-21571

Quick assessment

Affected
Dell UEFI BIOS https stack
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.

DELL Dell BIOSConnect是美国戴尔（DELL）公司的一个基础平台，使 BIOS 可连接到 Dell 的 HTTP 后端，并通过 HTTP 方法加载映像。 Dell BIOSConnect feature and Dell HTTPS Boot feature 存在信任管理问题漏洞，该漏洞源于Dell UEFI BIOS https栈存在不正确的证书验证漏洞。未经身份验证的远程攻击者可利用该漏洞可以使用中间人攻击来利用这个漏洞，这种攻击可能导致拒绝服务和负载篡改。

CVSS 5.9 · Medium EPSS 0.54% · P43
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I. Basic Information for CVE-2021-21571

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Dell UEFI BIOS https stack leveraged by the Dell BIOSConnect feature and Dell HTTPS Boot feature contains an improper certificate validation vulnerability. A remote unauthenticated attacker may exploit this vulnerability using a person-in-the-middle attack which may lead to a denial of service and payload tampering.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Dell BIOSConnect信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DELL Dell BIOSConnect是美国戴尔（DELL）公司的一个基础平台，使 BIOS 可连接到 Dell 的 HTTP 后端，并通过 HTTP 方法加载映像。 Dell BIOSConnect feature and Dell HTTPS Boot feature 存在信任管理问题漏洞，该漏洞源于Dell UEFI BIOS https栈存在不正确的证书验证漏洞。未经身份验证的远程攻击者可利用该漏洞可以使用中间人攻击来利用这个漏洞，这种攻击可能导致拒绝服务和负载篡改。
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
Dell UEFI BIOS https stack Gen 11, Gen 10 -

II. Public POCs for CVE-2021-21571

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III. Intelligence Information for CVE-2021-21571

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Other References for CVE-2021-21571 (1)

Same Patch Batch · Dell · 2021-06-24 · 4 CVEs total

CVE-2021-21572 7.2 HIGH Dell BIOSConnect feature 缓冲区错误漏洞
CVE-2021-21573 7.2 HIGH Dell BIOSConnect feature 缓冲区错误漏洞
CVE-2021-21574 7.2 HIGH Dell BIOSConnect feature 缓冲区错误漏洞

IV. Related Vulnerabilities

Same vendor: Dell
Same weakness: CWE-295

V. Comments for CVE-2021-21571

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