CVE-2021-30639
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.
- Affected products
- Alt Linux, Apache Tomcat
- Apache Tomcat
- = 8.5.64, 9.0.44, 10.0.3, 10.0.4
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 6.9% (93th percentile)
- Weakness
- CWE-755
- NVD status
- Modified
- Published
- 2021-07-12
No indexed exploits for CVE-2021-30639 yet
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No exploit for CVE-2021-30639 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.