CVE-2025-66565
9.8 · CRITICALOverview
CVE-2025-66565 is a critical-severity vulnerability affecting gofiber utils. It was published on December 9, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Fiber Utils is a collection of common functions created for Fiber. In versions 2.0.0-rc.3 and below, when the system's cryptographic random number generator (crypto/rand) fails, both functions silently fall back to returning predictable UUID values, including the zero UUID "00000000-0000-0000-0000-000000000000". The vulnerability occurs through two related but distinct failure paths, both ultimately caused by crypto/rand.Read() failures, compromising the security of all Fiber applications using these functions for security-critical operations. This issue is fixed in version 2.0.0-rc.4.
Remediation
Check the references section for vendor advisories and patches from gofiber. Update utils to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| gofiber | utils | 0 | Affected |
Frequently Asked Questions
What is CVE-2025-66565?
CVE-2025-66565 is a critical-severity vulnerability affecting gofiber utils. It was published on December 9, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2025-66565?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-66565?
Check the references section for vendor advisories and patches from gofiber. Update utils to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66565?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66565 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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