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

EPSS 0.42% · P62
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

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

CVE-2021-33037Incorrect Transfer-Encoding handling with HTTP/1.0
CVE-2021-30640Auth weakness in JNDIRealm
CVE-2021-30129DoS/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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