Vulnerability Database

383,371

Total vulnerabilities in the database

CVE-2005-0194 — squid / squid

Squid 2.5, when processing the configuration file, parses empty Access Control Lists (ACLs), including proxy_auth ACLs without defined auth schemes, in a way that effectively removes arguments, which could allow remote attackers to bypass intended ACLs if the administrator ignores the parser warnings.

  • Published: May 2, 2005
  • Updated: Sep 13, 2026
  • CVE: CVE-2005-0194
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: High
  • Score: 10
  • AV:N/AC:L/Au:N/C:C/I:C/A:C

No CWE or OWASP classifications available.

Software Affected versions
squid / squid = 2.0.patch1
squid / squid = 2.0.patch2
squid / squid = 2.0.pre1
squid / squid = 2.0.release
squid / squid = 2.1.patch1
squid / squid = 2.1.patch2
squid / squid = 2.1.pre1
squid / squid = 2.1.pre3
squid / squid = 2.1.pre4
squid / squid = 2.1.release
squid / squid = 2.2.devel3
squid / squid = 2.2.devel4
squid / squid = 2.2.pre1
squid / squid = 2.2.pre2
squid / squid = 2.2.stable1
squid / squid = 2.2.stable2
squid / squid = 2.2.stable3
squid / squid = 2.2.stable4
squid / squid = 2.2.stable5
squid / squid = 2.3.devel2
squid / squid = 2.3.devel3
squid / squid = 2.3.stable1
squid / squid = 2.3.stable2
squid / squid = 2.3.stable3
squid / squid = 2.3.stable4
squid / squid = 2.3.stable5
squid / squid = 2.4.stable1
squid / squid = 2.4.stable2
squid / squid = 2.4.stable3
squid / squid = 2.4.stable4
squid / squid = 2.4.stable6
squid / squid = 2.4.stable7
squid / squid = 2.5.stable1
squid / squid = 2.5.stable2
squid / squid = 2.5.stable3
squid / squid = 2.5.stable4
squid / squid = 2.5.stable5
squid / squid = 2.5.stable6

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.