Non-persistent client interruption via traffic-parser underflow
Published Jul 15, 2026 · Updated Jul 15, 2026
Integer underflow in Absolute Secure Access clients before 14.56 allows remote attackers to interrupt the client through tunnel traffic. The traffic parsing function underflows an integer while processing attacker-controlled tunnel-protocol data. Exploitation requires intimate protocol knowledge, total control of tunnel traffic, and active client processing; the denial of service is non-persistent.
Summary
What happened
Integer underflow in Absolute Secure Access clients before 14.56 allows remote attackers to interrupt the client through tunnel traffic. The traffic parsing function underflows an integer while processing attacker-controlled tunnel-protocol data. Exploitation requires intimate protocol knowledge, total control of tunnel traffic, and active client processing; the denial of service is non-persistent.
The record
- CVE
- CVE-2026-40954
- Published
- Jul 15, 2026
- Updated
- Jul 15, 2026
- Vendor
- Absolute Security
- Product
- Absolute Secure Access
- Classifications
- CWE-191, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 15, 2026CVE publishedPublication date reported by the CVE source.
- Jul 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <14.55
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo