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

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.

Published: 2025-12-09 Last update: 2025-12-11 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-66565 is rated Moderate Risk (43.7/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.06%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-66565

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-15 0.04% 0.06% +0.02%
2 2025-12-09 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-66565

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 4.0 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:H)
High confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:H)
High integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:L)
Limited availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:X)
Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:X)
Not evaluated.
Recovery (supplemental) (R:X)
Not evaluated.
Value density (supplemental) (V:X)
Not evaluated.
Vulnerability response effort (supplemental) (RE:X)
Not evaluated.
Provider urgency (supplemental) (U:X)
Not evaluated.
 — — [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2025-66565

GitHub Security Advisory for CVE-2025-66565

GHSA-m98w-cqp3-qcqr · Severity: critical · Ecosystem: go — Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values

Affected software / configurations for CVE-2025-66565

Vendor Product Version Raw CPE
gofiber utils <= 1.2.0 cpe:2.3:a:gofiber:utils:*:*:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta1:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta10:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta11:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta12:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta13:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta14:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta2:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta3:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta4:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta5:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta6:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta7:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta8:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:beta9:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:rc1:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:rc2:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:rc3:*:*:*:go:*:*
gofiber utils 2.0.0 cpe:2.3:a:gofiber:utils:2.0.0:rc4:*:*:*:go:*:*

References for CVE-2025-66565

cvelogic Threat Intelligence