CVE-2021-30639
DoS after non-blocking IO error
描述
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.
如何修補 CVE-2021-30639
要修補 CVE-2021-30639,請將受影響套件升級到下列已修補版本。
- —升級至 8.5.65 或更新版本
- —升級至 10.0.5 或更新版本
CVE-2021-30639 正在被利用嗎?
中等 — EPSS 為 6.9%,可持續追蹤但非最高優先。
受影響套件(2)
- >= 8.5.64, < 8.5.65, >= 9.0.44, < 9.0.45, >= 10.0.3, < 10.0.4, >= 10.0.4, < 10.0.5
- >= 10.0.3, < 10.0.5
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |