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CVE-2021-25122— Apache Tomcat h2c request mix-up

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
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.

Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 存在信息泄露漏洞，该漏洞源于可以在一个请求到另一个请求中复制请求头和数量有限的请求体，这意味着用户a和用户B都可以看到用户a的请求结果。

AI Predicted 8.8 Difficulty: Easy EPSS 18.11% · P97

Affected Version Matrix 3

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat Apache Tomcat 10< 10.0.2 affected
Apache Tomcat 9< 9.0.42 affected
Apache Tomcat 8.5< 8.5.62 affected
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I. Basic Information for CVE-2021-25122

Vulnerability Information
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Vulnerability Title
Apache Tomcat h2c request mix-up
Source: CVE Program / CVE List V5
Vulnerability Description
When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 存在信息泄露漏洞，该漏洞源于可以在一个请求到另一个请求中复制请求头和数量有限的请求体，这意味着用户a和用户B都可以看到用户a的请求结果。
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
Apache Software Foundation Apache Tomcat Apache Tomcat 10 ~ 10.0.2 -

II. Public POCs for CVE-2021-25122

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III. Intelligence Information for CVE-2021-25122

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Vendor Advisories for CVE-2021-25122 (6)

Mailing List Discussions for CVE-2021-25122 (9)

Same Patch Batch · Apache Software Foundation · 2021-03-01 · 3 CVEs total

CVE-2021-25329 Incomplete fix for CVE-2020-9484
CVE-2020-9479 unzip directory traversal

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-200