EUVD-2026-44788Severity 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
Network-delivered but requires attacker tunnel control (AC:H); active client session needed (UI:R); impact limited to transient client availability disruption (A:L), no C/I impact.
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-2026-40955 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 the traffic parsing function of Absolute Security Secure Access clients prior to version 14.55 enables a non-persistent denial-of-service condition against the client application. Exploitation demands the attacker possess intimate knowledge of the proprietary tunnel protocol AND maintain total control over that tunnel - an exceptionally high bar that drastically limits realistic attacker population. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two simultaneous conditions: (1) the attacker must possess intimate knowledge of the Absolute Secure Access tunnel protocol internals - not publicly documented - and (2) the attacker must have total control over the tunnel channel through which the victim client communicates, such as by operating a malicious or compromised tunnel endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The real-world risk of this vulnerability is very low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has compromised or controls a VPN/tunnel gateway that Absolute Secure Access clients connect to crafts malformed tunnel protocol messages exploiting intimate knowledge of the protocol structure to induce an integer underflow in the client's traffic parser. The targeted client application crashes or becomes temporarily unresponsive, disrupting the user's secure access session until the client recovers or is restarted. … |
| Remediation | Upgrade Absolute Secure Access clients to version 14.55 or later, which is the vendor-confirmed fix version per the Absolute Security vulnerability advisory at https://www.absolute.com/platform/security-information/vulnerability-archive/cve-2026-40955. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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