Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2025-66565

Severity CVSS v4.0:
CRITICAL
Type:
Unavailable / Other
Publication date:
09/12/2025
Last modified:
11/12/2025

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.

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 9.30 CRITICAL
Vector: 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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): High
Availability (VA): Low
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
9.30
Severity 4.0
CRITICAL
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:gofiber:utils:*:*:*:*:*:go:*:* 1.2.0 (including)
cpe:2.3:a:gofiber:utils:2.0.0:beta1:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta10:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta11:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta12:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta13:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta14:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta2:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta3:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta4:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta5:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta6:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta7:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta8:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta9:*:*:*:go:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools