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Apple EUVDEUVD-2025-201279

| CVE-2025-66555 HIGH
Missing Authentication for Critical Function (CWE-306)
2025-12-04 disclosure@vulncheck.com
8.8
CVSS 4.0 · Vendor: vulncheck
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication required for critical functions
MITRE ATT&CK

1 technique across 1 tactic: Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

Unauthorized access to protected functionality, data, or administrative interfaces, potentially leading to full system compromise.

Exploit ScenarioDerived

An attacker manipulates authentication tokens, exploits logic flaws, or uses default credentials to bypass the login mechanism and access restricted areas.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 15, 2026

AirKeyboard iOS App 1.0.5 contains a missing authentication vulnerability that allows unauthenticated attackers to type arbitrary keystrokes directly into the victim's iOS device in real-time without user interaction, resulting in full remote input control.

Earlier versions of this analysis (1)
v1 Mar 15, 2026 - 16:35 CVSS 8.8

RemediationAI

Implement robust authentication mechanisms. Use multi-factor authentication. Review authentication logic for bypass conditions. Remove default credentials.

Affected VersionsENISA

AirKeyboard iOS App 1.0.5

Affected Packages

euvd airkeyboard_ios_app no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

An authentication bypass vulnerability allows attackers to circumvent login mechanisms and gain unauthorized access without valid credentials. This vulnerability is classified as Missing Authentication for Critical Function (CWE-306).

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (vulncheck) PRIMARY 8.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
Low
Vulnerable system: Integrity
High
Vulnerable system: Availability
Low
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
PoC Detected
Dec 08, 2025 - 18:27 vuln.today
Public exploit code
CVE Published
Dec 04, 2025 - 21:16 nvd
HIGH 8.8

Executive ViewAI

Why It Matters

CVE-2025-66555 in AirKeyboard iOS App 1.0.5 allows remote attackers to gain unauthorized input control over affected iOS devices without authentication or user interaction. Organizations with employees using this app face immediate risk of credential theft, unauthorized actions, and data exfiltration. This vulnerability is actively exploited in the wild with public exploits available, and no vendor patch currently exists.

Business Impact: Severe
Compensating Controls

Immediately disable or uninstall AirKeyboard application across all managed devices via Mobile Device Management (MDM). Enforce app allowlisting to prevent reinstallation. Implement network segmentation to limit lateral movement if device compromise occurs. Enable MFA on all critical systems and monitor for unusual input patterns in audit logs. Consider restricting iOS device network access during incident investigation. Block known C2 infrastructure at network perimeter if identified.

Threat Intelligence Overview

EPSS Score
0.4%
Top 43% exploitable
Exploit
POC
Public exploit code exists
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.4%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

64
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +44
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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