CVE-2020-7212 describes a Denial of Service (DoS) vulnerability in the urllib3 library versions 1.25.2 through 1.25.7 for Python, specifically within the _encode_invalid_chars function. This flaw allows an attacker to consume excessive CPU resources due to an inefficient algorithm that processes percent-encoded characters, leading to an O(N^2) time complexity for URL processing. Rated as HIGH severity (CVSS 7.5), the vulnerability is easily exploitable over the network without user interaction, potentially causing service disruption. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.25.2, <= 1.25.7CPE matchmatch criteria | cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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