CVE-2026-116768 in Secure Access
Summary
by MITRE • 11/02/2026
CVE-2026-116768 is a missing length validation vulnerability in Secure Access servers prior to 14.61. Authenticated attackers can cause a persistent denial of service when connecting for the first time.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified as CVE-2026-116768 represents a critical input validation failure within the authentication subsystem of Secure Access servers running versions prior to 14.61. This flaw is categorized fundamentally as CWE-20 Improper Input Validation, specifically manifesting as a missing length check on data fields processed during the initial connection handshake. In secure network architectures, particularly those involving remote access gateways or virtual private networks, the integrity of input parameters is paramount to preventing resource exhaustion attacks. The specific technical flaw lies in the server's handling of user credentials or session initialization packets where the expected payload size is not rigorously bounded before processing begins. When an authenticated attacker initiates a connection for the first time, they can supply data structures that exceed the internal buffer limits or trigger infinite loops within the parsing logic due to this oversight.
From an operational perspective, this vulnerability allows for a persistent denial of service condition rather than a transient disruption. Unlike typical resource exhaustion attacks that might be mitigated by simple timeouts or connection resets, the nature of this flaw suggests that once triggered during the initial authentication phase, it may leave the server in a degraded state requiring manual intervention to restore normal operations. This persistence significantly amplifies the impact severity because it does not merely slow down service availability but potentially requires administrative recovery actions for each affected instance. The requirement for prior authentication means that while this is an authenticated attack vector, the ease of triggering such a persistent failure can lead to significant operational downtime and increased maintenance overhead for security teams responsible for maintaining these critical infrastructure components.
In terms of threat modeling and industry standards, this vulnerability aligns with MITRE ATT&CK technique T1499 Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion through application layer attacks. The lack of length validation is a classic precursor to buffer overflow conditions or logic errors that consume excessive CPU cycles or memory allocations indefinitely. Security architects should recognize this pattern as indicative of deeper code quality issues within the authentication module, suggesting that other input vectors may also be susceptible to similar validation failures. The persistent nature of the denial of service implies that standard automated recovery mechanisms might fail if they rely on simple process restarts without addressing the underlying state corruption caused by the malformed inputs.
To mitigate this risk, organizations must prioritize immediate patching to version 14.61 or later where these input validation checks have been implemented and tested. Until patches are applied, network-level controls such as strict rate limiting on authentication endpoints can help reduce the frequency of connection attempts, thereby lowering the probability of successful exploitation. Additionally, implementing deep packet inspection at the perimeter firewall to detect anomalously large payloads during the initial handshake phase can provide a layer of defense in depth. It is also advisable to review logging mechanisms to ensure that failed or suspicious authentication attempts are captured with sufficient detail for forensic analysis, allowing security teams to identify potential probing activity targeting this specific vulnerability vector before it results in persistent service disruption.