CVE-2026-55402 in Secure Access
Summary
by MITRE • 08/13/2026
CVE-2026-55402 is an out of bounds read vulnerability in Secure Access servers prior to version 14.57. Attackers with an ‘in the middle’ position can send specially crafted data to a server causing a persistent denial of service.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical out-of-bounds read flaw in Secure Access servers affecting versions prior to 14.57, classified under common weakness enumeration CWE-129. The vulnerability occurs when the server processes specially crafted data packets that exceed expected buffer boundaries during normal operation. An attacker positioned in an eavesdropping or man-in-the-middle position can exploit this weakness by transmitting malformed data sequences that trigger memory access violations within the application's processing routines.
The technical implementation of this flaw involves improper input validation mechanisms that fail to properly bounds-check data received from network connections. When legitimate network traffic is processed, the server's parsing functions attempt to read memory locations beyond allocated buffer limits, causing unpredictable behavior and system instability. This type of vulnerability directly maps to attack techniques described in the attack pattern taxonomy under T1498 for network denial of service and T1595 for network infiltration methods.
The operational impact of CVE-2026-55402 manifests as persistent denial of service conditions that can remain active until the affected server is manually restarted or the vulnerable software is updated. The vulnerability's persistence stems from its ability to cause the server process to crash repeatedly, creating a cascading failure effect that prevents legitimate users from accessing services. This type of denial of service attack specifically targets network infrastructure components and can result in significant business disruption.
Mitigation strategies for this vulnerability include immediate deployment of version 14.57 or later which contains proper bounds-checking mechanisms and input validation routines. Organizations should implement network segmentation controls to limit exposure and deploy intrusion detection systems that can identify malformed traffic patterns associated with this specific exploit. Additionally, regular security assessments and vulnerability scanning procedures should be enhanced to detect similar buffer overflow conditions in other network services. The fix addresses the underlying CWE-129 weakness through proper array bounds validation and memory access controls that prevent unauthorized memory reads beyond allocated boundaries, thereby eliminating the persistent denial of service risk.