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CVE-2021-30640— Auth weakness in JNDIRealm

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存在授权问题漏洞，该漏洞源于Apache Tomcat 的 JNDI 领域中的一个漏洞允许攻击者使用有效用户名的变体进行身份验证和/或绕过锁定领域提供的某些保护。

AI Predicted 5.9 Difficulty: Easy EPSS 9.89% · P95
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I. Basic Information for CVE-2021-30640

Vulnerability Information
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Vulnerability Title
Auth weakness in JNDIRealm
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.
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
Apache Tomcat 授权问题漏洞
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存在授权问题漏洞，该漏洞源于Apache Tomcat 的 JNDI 领域中的一个漏洞允许攻击者使用有效用户名的变体进行身份验证和/或绕过锁定领域提供的某些保护。
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 10.0.0-M1 to 10.0.5 -

II. Public POCs for CVE-2021-30640

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III. Intelligence Information for CVE-2021-30640

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Vendor Advisories for CVE-2021-30640 (6)

Mailing List Discussions for CVE-2021-30640 (2)

Same Patch Batch · Apache Software Foundation · 2021-07-12 · 4 CVEs total

CVE-2021-33037 Incorrect Transfer-Encoding handling with HTTP/1.0
CVE-2021-30639 DoS after non-blocking IO error
CVE-2021-30129 DoS/OOM leak vulnerability in Apache Mina SSHD Server

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation

V. Comments for CVE-2021-30640

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