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CVE-2021-4126

Quick assessment

Affected
Mozilla Thunderbird
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.

Mozilla Thunderbird是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird 存在安全漏洞，攻击者可利用该漏洞通过OpenPGP签名状态附加内容使用Mozilla Thunderbird上的恶意数据，以欺骗受害者。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2021-4126

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer, for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed message for the signature validity. This gave the false impression that the additional contents were also covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that belongs to the top level MIME part will be considered for the displayed status. This vulnerability affects Thunderbird < 91.4.1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Thunderbird是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird 存在安全漏洞，攻击者可利用该漏洞通过OpenPGP签名状态附加内容使用Mozilla Thunderbird上的恶意数据，以欺骗受害者。
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
Mozilla Thunderbird unspecified ~ 91.4.1 -

II. Public POCs for CVE-2021-4126

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III. Intelligence Information for CVE-2021-4126

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Vendor Advisories for CVE-2021-4126 (2)

Same Patch Batch · Mozilla · 2022-12-22 · 175 CVEs total

CVE-2022-36319 Mozilla Firefox 安全漏洞
CVE-2022-34481 Mozilla Firefox 输入验证错误漏洞
CVE-2022-34482 Mozilla Firefox 安全漏洞
CVE-2022-34483 Mozilla Firefox 安全漏洞
CVE-2022-34484 Mozilla Firefox 资源管理错误漏洞
CVE-2022-34485 Mozilla Firefox 缓冲区错误漏洞
CVE-2022-36314 Mozilla Firefox 代码问题漏洞
CVE-2022-36315 Mozilla Firefox 资源管理错误漏洞
CVE-2022-36316 Mozilla Firefox 输入验证错误漏洞
CVE-2022-36317 Mozilla Firefox 输入验证错误漏洞
CVE-2022-36318 Mozilla Firefox 竞争条件问题漏洞
CVE-2022-38475 Mozilla Firefox 安全漏洞
CVE-2022-40957 Mozilla Firefox 安全漏洞
CVE-2022-40956 Mozilla Firefox 跨站脚本漏洞
CVE-2022-38478 Mozilla Firefox 缓冲区错误漏洞
CVE-2022-38477 Mozilla Firefox 缓冲区错误漏洞
CVE-2022-38476 Mozilla Firefox ESR 资源管理错误漏洞
CVE-2022-38473 Mozilla Firefox 安全漏洞
CVE-2022-36320 Mozilla Firefox 缓冲区错误漏洞
CVE-2022-38472 Mozilla Firefox 访问控制错误漏洞

Showing top 20 of 175 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2021-4126

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