CVE-2021-33503
Catastrophic backtracking in URL authority parser when passed URL containing many @ characters
7.5
HIGH
CVSS 3.1
EPSS 3.3%
描述
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
如何修補 CVE-2021-33503
要修補 CVE-2021-33503,請將受影響套件升級到下列已修補版本。
- —升級至 1.26.5 或更新版本
CVE-2021-33503 正在被利用嗎?
低 — EPSS 為 3.3%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- >= 1.25.4, < 1.26.5
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 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 |