P4Verified

CVE-2021-28363: urllib3 from 1.26.0 (inclusive), before 1.26.4 (exclusive); +6 more affected products

CVE-2021-28363. CVSS 3.1 base score 6.5 (MEDIUM, NVD). EPSS 0.02109 (percentile 0.81299), scored 13-Oct-2026.

Affected technology

urllib3 · from 1.26.0 (inclusive), before 1.26.4 (exclusive)
python

fedora · 34
fedoraproject

peoplesoft enterprise peopletools · 8.59
oracle

n/a · n/a
Vendor not specified by the source

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

Description’s affected range: before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies

Component: Not specified by the source

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

NVD’s CVSS 3.1 assessment (base score 6.5/10) rates confidentiality and integrity impact as low; availability impact as none. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 14-Oct-2026 15:58 UTC

CWE: CWE-295
CCR priority: 26.5 /100 (P4)
CVSS 3.1: 6.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N · NVD
EPSS: 0.02109 · percentile 0.81299 · 2026-10-13
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-14 15:56:36.793806+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2021-28363.html