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CVE-2021-38507

Quick assessment

Affected
Mozilla Firefox
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 Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 存在访问控制错误漏洞，该漏洞源于HTTP2 (RFC 8164) 的机会加密功能允许将连接透明地升级到 TLS，同时保留 HTTP 连接的视觉属性，包括与端口 80 上的未加密连接同源。相同的 IP 地址（例如端口 8443）没有选择加入机会加密；网络攻击者可以将浏览器到 443 端口的连接转发到 8443 端口，从而导致浏览器将 8443 端口的内容视为与 HTTP 同源。这是通过禁用使用率

AI Predicted 7.5 Difficulty: Moderate EPSS 0.80% · P54
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I. Basic Information for CVE-2021-38507

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
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 Firefox 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 存在访问控制错误漏洞，该漏洞源于HTTP2 (RFC 8164) 的机会加密功能允许将连接透明地升级到 TLS，同时保留 HTTP 连接的视觉属性，包括与端口 80 上的未加密连接同源。相同的 IP 地址（例如端口 8443）没有选择加入机会加密；网络攻击者可以将浏览器到 443 端口的连接转发到 8443 端口，从而导致浏览器将 8443 端口的内容视为与 HTTP 同源。这是通过禁用使用率
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 Firefox unspecified ~ 94 -
Mozilla Thunderbird unspecified ~ 91.3 -
Mozilla Firefox ESR unspecified ~ 91.3 -

II. Public POCs for CVE-2021-38507

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III. Intelligence Information for CVE-2021-38507

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Vendor Advisories for CVE-2021-38507 (8)

Mailing List Discussions for CVE-2021-38507 (2)

Same Patch Batch · Mozilla · 2021-12-08 · 27 CVEs total

CVE-2021-43535 Mozilla Firefox 资源管理错误漏洞
CVE-2021-43527 Mozilla Network Security Services 缓冲区错误漏洞
CVE-2021-43546 Mozilla Firefox 安全漏洞
CVE-2021-43545 Mozilla Firefox 安全漏洞
CVE-2021-43544 Mozilla Firefox 跨站脚本漏洞
CVE-2021-43543 Mozilla Firefox 跨站脚本漏洞
CVE-2021-43542 Mozilla Firefox ESR 信息泄露漏洞
CVE-2021-43541 Mozilla Firefox ESR 安全漏洞
CVE-2021-43540 Mozilla Firefox 权限许可和访问控制问题漏洞
CVE-2021-43539 Mozilla Firefox ESR 资源管理错误漏洞
CVE-2021-43538 Mozilla Firefox 竞争条件问题漏洞
CVE-2021-43537 Mozilla Firefox ESR 代码问题漏洞
CVE-2021-43536 Mozilla Firefox ESR 信息泄露漏洞
CVE-2021-38503 Mozilla Firefox 安全特征问题漏洞
CVE-2021-43534 Mozilla Firefox 缓冲区错误漏洞
CVE-2021-43533 Mozilla Firefox 安全漏洞
CVE-2021-43532 Mozilla Firefox 输入验证错误漏洞
CVE-2021-43531 Mozilla Firefox 访问控制错误漏洞
CVE-2021-43530 Mozilla Firefox 跨站脚本漏洞
CVE-2021-43528 Mozilla Thunderbird 安全特征问题漏洞

Showing top 20 of 27 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2021-38507

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