CVE-2026-55398
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCVE-2026-55398 is a memory management vulnerability in Secure Access clients and servers prior to 14.55. Attackers with intimate knowledge of and total control over the tunnel protocol can create a non-persistent DoS against the server.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is a memory management vulnerability in Secure Access clients and servers running versions prior to 14.55. An attacker with intimate knowledge of and total control over the proprietary tunnel protocol can exploit improper memory handling to cause a non-persistent denial of service against the server.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Secure Access software installationLocate Secure Access client or server software on the system. Look for processes named 'Secure Access', 'SAClient', or 'SAServer', or check installed programs for Secure Access components.Affected if Secure Access software is found running or installed on the system
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Determine installed versionUse the software's built-in version check command, about dialog, or check version information in the software's binary/properties. Common methods: 'SecureAccess -v', right-click executable > Properties > Details, or check the Windows registry under HKLM\Software\SecureAccess.Affected if The installed version is lower than 14.55 (e.g., 14.54, 14.50, any version prior to 14.55)
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Verify tunnel protocol configurationExamine the Secure Access configuration files or admin console for tunnel protocol settings. Look for 'proprietary tunnel', 'custom tunnel', 'secure tunnel', or similar tunnel-related protocol options.Affected if The proprietary tunnel protocol feature is enabled or configured in the Secure Access settings
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Assess network exposureReview firewall rules, network segmentation, and access controls surrounding the Secure Access server. Determine if the server listens on external-facing interfaces or is accessible from untrusted networks.Affected if The Secure Access server is directly exposed to untrusted or external networks without proper network segmentation
You are affected if Secure Access software with a version prior to 14.55 is installed, the proprietary tunnel protocol is enabled, and the server is accessible to untrusted actors who could control the tunnel protocol.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade all Secure Access clients and servers to version 14.55 or later. Since exploitation requires intimate knowledge and total control of the tunnel protocol, ensure network segmentation limits exposure to trusted personnel only.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-55398 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-55398 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data