CVE-2025-27260 Overview
CVE-2025-27260 is an Improper Filtering of Special Elements vulnerability affecting Ericsson Indoor Connect 8855 versions prior to 2025.Q3. This flaw allows authenticated attackers with network access to bypass input validation controls, potentially leading to unauthorized modification of certain information within the affected system.
Critical Impact
Authenticated attackers can exploit improper input filtering to achieve unauthorized data modification and potentially disrupt system availability on Ericsson Indoor Connect 8855 deployments.
Affected Products
- Ericsson Indoor Connect 8855 versions prior to 2025.Q3
Discovery Timeline
- 2026-03-25 - CVE-2025-27260 published to NVD
- 2026-03-25 - Last updated in NVD database
Technical Details for CVE-2025-27260
Vulnerability Analysis
This vulnerability is classified under CWE-790 (Improper Filtering of Special Elements), indicating that the affected software fails to properly filter or sanitize special characters or elements from user-controlled input before processing. The vulnerability is exploitable over the network by authenticated users without requiring any user interaction. Successful exploitation can result in unauthorized modification of data and potential availability impacts to the system.
The Ericsson Indoor Connect 8855 is a network infrastructure component used in enterprise and telecommunications environments. Due to the nature of improper input filtering vulnerabilities, attackers may be able to inject malicious content or manipulate system behavior by crafting specially formatted input that bypasses the intended security controls.
Root Cause
The root cause of CVE-2025-27260 lies in insufficient input validation and filtering mechanisms within the Ericsson Indoor Connect 8855 firmware. The system fails to properly sanitize special elements from user-supplied input, allowing specially crafted data to be processed in unintended ways. This lack of proper filtering enables attackers to manipulate system behavior or modify protected information.
Attack Vector
The attack vector for this vulnerability is network-based, requiring the attacker to have low-privilege authenticated access to the target system. The attack requires no user interaction and can be executed remotely. An attacker would need to:
- Obtain authenticated access to the Ericsson Indoor Connect 8855 system
- Identify input fields or API endpoints that fail to properly filter special elements
- Craft malicious input containing special characters or elements that bypass filtering
- Submit the crafted input to modify protected information or disrupt system availability
For detailed technical information about exploitation mechanics, refer to the Ericsson CVE-2025-27260 Advisory.
Detection Methods for CVE-2025-27260
Indicators of Compromise
- Unexpected configuration changes on Ericsson Indoor Connect 8855 devices
- Anomalous API requests containing special characters or encoding sequences
- Unusual administrative activity from accounts that should have limited privileges
- System logs showing repeated attempts to submit malformed input data
Detection Strategies
- Implement network traffic monitoring to identify suspicious requests targeting Indoor Connect 8855 management interfaces
- Review authentication logs for unusual access patterns or privilege escalation attempts
- Deploy intrusion detection rules to identify input validation bypass attempts
- Monitor for unexpected configuration changes or data modifications on affected devices
Monitoring Recommendations
- Enable detailed logging on Ericsson Indoor Connect 8855 devices to capture all administrative actions
- Configure alerts for any configuration modifications outside of scheduled maintenance windows
- Implement baseline monitoring to detect anomalous behavior on network infrastructure components
- Regularly audit user accounts and access privileges on affected systems
How to Mitigate CVE-2025-27260
Immediate Actions Required
- Upgrade Ericsson Indoor Connect 8855 to version 2025.Q3 or later
- Restrict network access to management interfaces using firewall rules and network segmentation
- Review and minimize the number of accounts with access to affected systems
- Monitor for any signs of exploitation using the detection strategies outlined above
Patch Information
Ericsson has addressed this vulnerability in Indoor Connect 8855 version 2025.Q3 and later releases. Organizations should apply the update as soon as possible after appropriate testing. For detailed patch information and download links, refer to the Ericsson IndoorConnect March 2026 Bulletin.
Workarounds
- Implement strict network segmentation to limit access to Indoor Connect 8855 management interfaces
- Apply web application firewall (WAF) rules to filter potentially malicious special characters
- Enforce the principle of least privilege for all accounts with system access
- Disable any unused network services or management interfaces on affected devices
# Example network segmentation recommendation
# Restrict management interface access to trusted administrative networks only
# Implement firewall rules to limit source IP addresses that can reach the device
# Ensure management traffic is isolated from general network traffic
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
