CVE-2025-62003 in Server Intrusion Protection
Summary
by MITRE • 12/18/2025
BullWall Server Intrusion Protection has a noticeable configuration-dependent delay before the MFA check for RDP connections. A remote, authenticated attacker can potentially bypass detection during this delay. Versions 4.6.0.0, 4.6.0.6, 4.6.0.7, and 4.6.1.4 are affected. Other versions may also be affected.
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Analysis
by VulDB Data Team • 01/15/2026
The vulnerability identified as CVE-2025-62003 affects BullWall Server Intrusion Protection systems, specifically targeting the timing behavior of multi-factor authentication processes for RDP connections. This configuration-dependent delay represents a critical security weakness that can be exploited by remote attackers who have already established authentication credentials. The flaw manifests as a temporal window during which the system fails to enforce mandatory authentication checks, creating an opportunity for unauthorized access attempts to bypass detection mechanisms.
The technical implementation of this vulnerability stems from the system's design where MFA verification occurs with a configurable delay that varies based on environmental settings and system configurations. During this delay period, the intrusion protection system maintains a state where it does not actively enforce multi-factor authentication requirements for RDP connections, allowing potential attackers to exploit this gap in security enforcement. This timing issue creates a window of opportunity where malicious actors can attempt unauthorized access before the system completes its authentication sequence and properly validates all required factors.
From an operational impact perspective, this vulnerability directly undermines the security posture of organizations relying on BullWall Server Intrusion Protection for RDP access control. The delay creates a race condition where legitimate security controls are temporarily suspended, potentially allowing credential theft, unauthorized network access, or lateral movement attacks to succeed without detection. Attackers can leverage this window to perform reconnaissance activities, establish persistent access, or execute more sophisticated attacks that would otherwise be blocked by the full MFA enforcement mechanism. The vulnerability affects multiple versions including 4.6.0.0, 4.6.0.6, 4.6.0.7, and 4.6.1.4, suggesting this is a persistent issue across the product line that requires immediate attention from security teams.
Security professionals should implement immediate mitigations including configuration reviews to minimize the delay window, deployment of additional monitoring controls to detect anomalous access patterns during the delay period, and consideration of alternative authentication mechanisms that do not rely on timing-dependent validation. Organizations should also conduct comprehensive vulnerability assessments to identify if other components within their security infrastructure are similarly affected by timing-based authentication bypass vulnerabilities. The mitigation strategies should align with industry standards such as those recommended in the CWE catalog for timing-dependent security flaws and should incorporate defensive measures consistent with ATT&CK framework guidance for credential access and defense evasion techniques.
The vulnerability demonstrates a fundamental weakness in how authentication systems handle temporal consistency and enforcement timing, particularly in network security appliances where multiple security controls must coordinate effectively. This issue highlights the importance of implementing robust security controls that do not introduce temporal gaps in protection, as such gaps can be exploited to undermine even well-designed multi-factor authentication systems. The affected versions suggest that this is not an isolated incident but rather a systemic design consideration that requires broader architectural review and potential code modifications to ensure consistent enforcement of security controls regardless of configuration parameters or environmental conditions.