CVE-2026-7255
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 · unedited** UNSUPPORTED WHEN ASSIGNED ** An improper restriction of excessive authentication attempts vulnerability in the web management interface of Zyxel WRE6505 v2 firmware version V1.00(ABDV.3)C0 could allow an adjacent attacker on the LAN to brute-force the password and bypass authentication.
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 confidenceThe Zyxel WRE6505 v2 wireless range extender firmware V1.00(ABDV.3)C0 contains an improper restriction of excessive authentication attempts vulnerability in its web management interface. An adjacent attacker on the LAN can perform unlimited password brute-force attempts to bypass authentication due to missing rate limiting or account lockout mechanisms.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= v1.00\(abdv.3\)c0CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 the device modelLocate the physical device or log into the network to confirm you have a Zyxel WRE6505 v2 wireless range extender. Check the product label on the device itself or review your network inventory documentation.Affected if The device is not a Zyxel WRE6505 v2 model, the vulnerability does not apply.
-
Check the installed firmware versionAccess the device's web management interface (typically via HTTP to the device's LAN IP) and navigate to the Status or System Info page to view the firmware version, or use the device's CLI if available. Compare the displayed version to v1.00(ABDV.3)C0.Affected if The installed firmware is NOT v1.00(ABDV.3)C0, the specific vulnerability does not apply. Note that other versions may have different issues but this CVE is specific to this version.
-
Confirm web management interface accessibilityDetermine if the device's web management interface is reachable from your network. Attempt to access the device's IP address from a computer on the same LAN segment via HTTP/HTTPS. Verify the login page loads.Affected if The web management interface is not accessible (e.g., firewall blocks access, interface is disabled), the exploitation vector is not available, though the weakness still exists in the firmware.
-
Verify lack of rate limiting existsSince the CVE states there is no rate limiting or account lockout, you would observe this by attempting multiple failed login attempts (in an authorized penetration test or with documented consent) - the system will accept unlimited attempts without blocking or delaying responses.Affected if The device implements rate limiting or account lockout after failed attempts, the specific vulnerability condition is mitigated.
You are affected if you have a Zyxel WRE6505 v2 running firmware v1.00(ABDV.3)C0 with its web management interface accessible on the network, regardless of whether rate limiting is currently being exploited.
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 dataSince the device is end-of-life and unsupported, replace the device with a currently supported model or implement network segmentation to restrict access to the management interface, such as placing the device in an isolated VLAN with limited access.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-7255 — 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-2026-7255 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