CVE-2026-22316
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 · uneditedA remote attacker with user privileges for the webUI can use the setting of the TFTP Filename with a POST Request to trigger a stack-based Buffer Overflow, resulting in a DoS attack.
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 vulnerability is a stack-based buffer overflow in the TFTP filename parameter handling of the webUI. An authenticated user can trigger the overflow by sending a specially crafted POST request with an oversized TFTP filename value, causing a denial of service.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
-
Identify if your product has a web UI with TFTP functionalityLocate the web interface configuration panel and check if there is a TFTP settings or filename parameter field available to authenticated usersAffected if The product has a webUI with accessible TFTP configuration that accepts filename parameters
-
Determine if authentication is required for TFTP configuration accessReview access control settings for the webUI TFTP configuration area to confirm whether a user must be logged in to modify TFTP parametersAffected if The TFTP configuration is accessible to authenticated users without additional network-level restrictions
-
Check for TFTP filename length input validationInspect the webUI or API configuration for TFTP filename fields. Look for maximum length restrictions, input validation, or character filtering on the filename parameterAffected if There is no visible length limit or input validation enforced on the TFTP filename parameter in the webUI
-
Review application logs for crash or overflow indicatorsExamine system and application logs for denial of service events, crashes, or restarts that coincide with TFTP configuration changes using unusually long filename valuesAffected if Logs show crashes or service disruptions following TFTP filename configuration attempts with long strings
-
Check for security monitoring on TFTP web endpointsReview web server logs, WAF logs, or intrusion detection alerts for POST requests to TFTP configuration endpoints with abnormally long filename parametersAffected if Network monitoring shows POST requests to TFTP endpoints with oversized filename values (potential exploitation attempts)
-
Verify if vendor has released advisory for this CVESearch vendor security advisories using CVE-2026-22316 to confirm if your specific product version is listed as affectedAffected if Your product version matches a version the vendor has publicly acknowledged as vulnerable to CVE-2026-22316
You are affected if your product has a webUI with TFTP filename configuration accessible to authenticated users without proper input length validation on that parameter.
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 dataImplement strict input validation and bounds checking on the TFTP filename parameter before copying to the stack buffer. Limit the filename length to the buffer size and sanitize special characters.
- Consultation3.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-22316 — 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-2026-22316 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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