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CVE-2021-30639— DoS after non-blocking IO error

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 存在安全漏洞，该漏洞源于作为改进非阻塞 I/O 期间错误处理的部分与请求对象关联的错误标志在请求之间不会重置。攻击者可利用该漏洞触发拒绝服务。

AI Predicted 5.3 Difficulty: Trivial EPSS 6.89% · P94
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I. Basic Information for CVE-2021-30639

Vulnerability Information
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Vulnerability Title
DoS after non-blocking IO error
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag associated with the Request object was not reset between requests. This meant that once a non-blocking I/O error occurred, all future requests handled by that request object would fail. Users were able to trigger non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64.
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 安全漏洞
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 存在安全漏洞，该漏洞源于作为改进非阻塞 I/O 期间错误处理的部分与请求对象关联的错误标志在请求之间不会重置。攻击者可利用该漏洞触发拒绝服务。
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 10.0.3 to 10.0.4 -

II. Public POCs for CVE-2021-30639

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III. Intelligence Information for CVE-2021-30639

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Vendor Advisories for CVE-2021-30639 (3)

Mailing List Discussions for CVE-2021-30639 (3)

Other References for CVE-2021-30639 (1)

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

CVE-2021-33037 Incorrect Transfer-Encoding handling with HTTP/1.0
CVE-2021-30640 Auth weakness in JNDIRealm
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-2021-30639

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