CVE-2025-15515: EasyShare Information Disclosure Flaw

CVE-2025-15515 Overview

CVE-2025-15515 is an authentication bypass vulnerability affecting the EasyShare module in Vivo devices. The authentication mechanism for a specific feature in the EasyShare module contains a flaw that, when specific conditions are met on a local network, can lead to unauthorized data leakage. This vulnerability is classified under CWE-306 (Missing Authentication for Critical Function).

Critical Impact

Attackers on the same local network can potentially bypass authentication controls and access sensitive data without proper authorization, leading to confidentiality breaches.

Affected Products

• Vivo EasyShare Module
• Vivo devices with EasyShare functionality enabled

Discovery Timeline

• 2026-03-13 - CVE-2025-15515 published to NVD
• 2026-03-16 - Last updated in NVD database

Technical Details for CVE-2025-15515

Vulnerability Analysis

This vulnerability stems from a missing authentication mechanism (CWE-306) within the EasyShare module's feature set. The flaw allows unauthenticated access to functionality that should require proper authentication validation. The attack requires the adversary to be on an adjacent network (such as the same local network or WiFi) and requires some user interaction to successfully exploit.

The vulnerability specifically affects the confidentiality of data, with the potential for high-impact data leakage when the attack conditions are satisfied. The integrity and availability of the system remain unaffected according to the vulnerability assessment.

Root Cause

The root cause lies in the EasyShare module's failure to properly implement authentication checks for a critical feature. When certain conditions are met within a local network environment, the authentication verification is either bypassed or entirely absent, allowing unauthorized parties to access protected functionality. This represents a fundamental design flaw where security-critical functions lack proper access control mechanisms.

Attack Vector

The attack vector is through an adjacent network, meaning an attacker must have network-level access to the same local network as the target device. The attack requires low complexity to execute but does require some form of user interaction to be successful.

An attacker positioned on the same WiFi network or local area network could exploit this vulnerability by:

1. Identifying devices running the vulnerable EasyShare module on the local network
2. Targeting the specific feature with the missing authentication
3. Accessing protected data or functionality without providing valid credentials

The vulnerability does not require any privileges to exploit, making it accessible to any attacker with local network access.

Detection Methods for CVE-2025-15515

Indicators of Compromise

• Unusual network traffic patterns to or from EasyShare services on local network
• Unexpected data access requests from unrecognized devices on the same network
• Anomalous authentication-less connections to EasyShare functionality

Detection Strategies

• Monitor network traffic for unauthenticated requests to EasyShare module endpoints
• Implement network segmentation monitoring to detect lateral movement attempts
• Deploy intrusion detection signatures for suspicious EasyShare protocol activity

Monitoring Recommendations

• Enable verbose logging on EasyShare module communications where possible
• Monitor for multiple connection attempts from unknown devices on the local network
• Implement network traffic analysis to identify potential exploitation attempts

How to Mitigate CVE-2025-15515

Immediate Actions Required

• Review the official Vivo Security Advisory #21 for vendor-specific guidance
• Disable EasyShare functionality if not actively required until a patch is available
• Implement network segmentation to limit exposure of vulnerable devices
• Restrict local network access to trusted devices only

Patch Information

Vivo has published security advisory information regarding this vulnerability. Users should consult the official Vivo Security Advisory #21 for detailed patch information and update instructions. Apply the latest firmware or software updates provided by Vivo to address this authentication bypass vulnerability.

Workarounds

• Disable the EasyShare module functionality when not in active use
• Implement strict network access controls to limit who can join the local network
• Use network isolation to separate devices with EasyShare from untrusted network segments
• Monitor and audit network connections to devices with EasyShare enabled