CRITICAL CVSS 9.3
Published: 2025-08-01

CVE-2025-54574

squid-cache squid Security Advisory (CVE-2025-54574)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2025-54574 impacting squid-cache squid. Evaluated with CVSS Base Score of 9.3 (CRITICAL).

Original NVD Description

Source: NIST NVD
Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when processing URN due to incorrect buffer management. This has been fixed in version 6.4. To work around this issue, disable URN access permissions.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Network (AV:N)
Exploitable remotely across internet boundaries
Attack Complexity
Low (AC:L)
No specialized conditions required
Privileges Required
None (PR:N)
Unauthenticated execution
User Interaction
None (UI:N)
Zero human interaction required
Scope
Changed (S:C)
Impacts components beyond caller authority
Confidentiality
None (C:N)
No data confidentiality impact
Integrity
Low (I:L)
Partial data modification possible
Availability
High (A:H)
Total denial of service or shutdown

🎯 Affected Versions Matrix

Affected Product squid-cache / squid
Affected Versions *
Weakness Enumeration CWE-122

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2025-54574 impacting squid-cache squid.

⚡ Nuclei Detection Template (YAML) cve-2025-54574.yaml
id: cve-2025-54574

info:
  name: squid-cache squid - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: critical
  description: |
    Automated signature & scanner for CVE-2025-54574 affecting squid-cache squid.
    Evaluation: Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution atta...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2025-54574
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
    cvss-score: 9.3
    cve-id: CVE-2025-54574
    cwe-id: CWE-122
  tags: cve,cve-2025-54574,squid-cache,squid,critical

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "squid"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2025-54574.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2025-54574
# Target: squid-cache squid | CVSS: 9.3 (CRITICAL)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2025-54574 (squid-cache squid)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against squid-cache squid scope (*).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-2025-54574.sh
# Recommended Remediation & Patching Commands for CVE-2025-54574
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install squid 2>/dev/null || \
sudo dnf upgrade squid 2>/dev/null || \
sudo yum update squid

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i squid 2>/dev/null || rpm -qa | grep -i squid

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2025-54574 in squid-cache squid?

Review vendor-specific security notices and update squid-cache squid packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-2025-54574?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-2025-54574?

CVE-2025-54574 is classified with a CVSS 3.1 Base Score of 9.3 (CRITICAL). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
9.3
CRITICAL SEVERITY
CVE ID CVE-2025-54574
Weakness CWE-122
Vendor squid-cache
Product squid
Published 2025-08-01
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H