CVE-2026-5566
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 vulnerability was detected in UTT HiPER 1250GW up to 3.2.7-210907-180535. This affects the function strcpy of the file /goform/formNatStaticMap. Performing a manipulation of the argument NatBind results in buffer overflow. Remote exploitation of the attack is possible. The exploit is now public and may be used.
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 confidenceA buffer overflow vulnerability exists in the UTT HiPER 1250GW router firmware (up to version 3.2.7-210907-180535) in the /goform/formNATStaticMap web form handler. The unsafe strcpy function is used to process the NatBind HTTP parameter without bounds checking, allowing remote attackers to overflow a fixed-size buffer via crafted input.
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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
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Identify router firmware versionAccess the router's web administration interface and navigate to the Status or System Information page to view the firmware version, or use the command 'cat /proc/version' or 'nvram get firmware_version' via telnet/SSH if available. Compare the displayed version to the affected range (versions up to and including 3.2.7-210907-180535).Affected if The firmware version is 3.2.7-210907-180535 or earlier.
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Confirm NAT static mapping feature is enabledLog into the router web interface and check the NAT or Port Forwarding settings section for any configured static mapping entries. Look for a feature labeled 'NAT Static Map', 'Static NAT', or 'One-to-One NAT' in the forwarding configuration.Affected if NAT static mapping is configured or enabled in the router settings.
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Verify web management interface accessibilityCheck if the router's web interface on ports 80/443 is reachable from network segments outside the trusted local network. Use a port scanner or browser access test from an external IP or untrusted network segment.Affected if The router web management interface is accessible from untrusted networks.
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Inspect NAT static mapping configuration fileIf telnet/SSH access is available, examine /etc/config/nat or the NVRAM settings for 'NatBind' or 'static_nat' entries using 'nvram show | grep -i nat'.Affected if The NatBind parameter is present in the configuration and contains user-controlled input.
The router is affected if it runs firmware version 3.2.7-210907-180535 or earlier AND has NAT static mapping enabled with the web interface accessible to potential attackers.
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 dataReplace the unsafe strcpy call with bounds-safe functions (strncpy, strlcpy, or snprintf) and implement input validation on the NatBind parameter. If a patched firmware version is available, upgrade immediately; otherwise, restrict access to the router's web interface via network segmentation or firewall rules.
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- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
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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-2026-5566 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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- Version or environment caveats, and links to real fixes
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