AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2019-12523

CRITICAL · CVSS 9.1 EPSS 4.30%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2019-11-26 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE
CVE-2019-12523
Severity
CRITICAL
CVSS
9.1
EPSS
4.30%

Original NVD Description

An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only listen on localhost.