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CVE-2025-66565— Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values

Quick assessment

Affected
gofiber utils
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fiber Utils是Fiber开源的一个通用函数库。 Fiber Utils 2.0.0-rc.3及之前版本存在安全特征问题漏洞，该漏洞源于随机数生成器失败时返回可预测UUID，可能导致安全操作被破坏。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning
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I. Basic Information for CVE-2025-66565

Vulnerability Information
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Vulnerability Title
Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
Fiber Utils 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fiber Utils是Fiber开源的一个通用函数库。 Fiber Utils 2.0.0-rc.3及之前版本存在安全特征问题漏洞，该漏洞源于随机数生成器失败时返回可预测UUID，可能导致安全操作被破坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gofiber utils github.com/gofiber/utils <= 1.2.0 -

II. Public POCs for CVE-2025-66565

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III. Intelligence Information for CVE-2025-66565

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Patches & Fixes for CVE-2025-66565 (1)

Vendor Advisories for CVE-2025-66565 (1)

IV. Related Vulnerabilities

Same product: utils
Same vendor: gofiber
Same weakness: CWE-252

V. Comments for CVE-2025-66565

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