EUVD-2026-44787Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AV:N/AC:H reflects network attack with high complexity; UI:R because user must connect to attacker-controlled channel; impact is low availability loss only with no scope change.
Primary rating from Vendor (Absolute).
CVSS VectorVendor: Absolute
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
CVE-2026-40954 is an integer underflow vulnerability in the traffic parsing function of Secure Access clients prior to 14.55. Attackers with intimate knowledge of and total control over the tunnel protocol can create a non-persistent DoS against their client
AnalysisAI
Integer underflow in Absolute Security's Secure Access client prior to version 14.55 allows an attacker with full control over the tunnel protocol to cause a non-persistent denial of service against the client. The exploitation bar is extremely high - the attacker must possess both intimate knowledge of the proprietary tunnel protocol and total control over the communication channel. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following simultaneously: (1) the attacker must have total control over the tunnel protocol channel - either by operating a server the client connects to, or by holding a man-in-the-middle position; (2) the attacker must have intimate knowledge of the Absolute Secure Access proprietary tunnel protocol internals to construct a triggering payload; (3) active user interaction is required (UI:A in CVSS 4.0), meaning the user must initiate or maintain a connection; and (4) a specific attack precondition (AT:P) must be met. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is minimal. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker operating a malicious Secure Access server, or holding a man-in-the-middle position on the network path, crafts tunnel protocol traffic specifically engineered to trigger the integer underflow in the client's parsing function. The client crashes or becomes unresponsive for the duration of the attack, losing its tunnel connection. … |
| Remediation | Patch available per vendor advisory: upgrade Absolute Secure Access clients to version 14.55 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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