CVE-2021-20092
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 · uneditedThe web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict access to sensitive information from an unauthorized actor.
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 Buffalo WSR-2533DHPL2 (firmware <= 1.02) and WSR-2533DHP3 (firmware <= 1.24) routers contain a web interface authorization flaw that allows unauthenticated actors to access sensitive information that should be restricted to authorized users.
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<= 1.02<= 1.24CVSS 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
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/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 Buffalo WSR-2533DHPL2 or WSR-2533DHP3 routers on your networkScan your network for devices with Buffalo vendor MAC OUI (identify via network scanning tools or check device labels). Confirm the model number matches WSR-2533DHPL2 or WSR-2533DHP3.Affected if A Buffalo WSR-2533DHPL2 or WSR-2533DHP3 router exists on the network
-
Check the installed firmware versionAccess the router web interface (typically at http://192.168.1.1 or the gateway address) and navigate to the firmware version information page, usually under Administration, System, or Settings. Alternatively, check the label on the device itself.Affected if The firmware version is <= 1.02 for WSR-2533DHPL2 or <= 1.24 for WSR-2533DHP3
-
Test web interface access without authenticationOpen a browser or use a tool like curl to access the router web interface URL (such as http://<router-ip>/) without providing any login credentials. Observe whether the interface loads or returns any sensitive pages without requiring authentication.Affected if The router web interface or sensitive pages load without prompting for login credentials
-
Attempt to access restricted sensitive informationTry accessing common restricted endpoints that should require authorization (such as configuration pages, status pages, or diagnostic outputs) without logging in. Use curl or a browser to request these URLs and check if sensitive data is returned.Affected if Sensitive router information such as configuration, status, or network details is returned without authentication
You are affected if you have a Buffalo WSR-2533DHPL2 with firmware <= 1.02 or WSR-2533DHP3 with firmware <= 1.24, and the web interface allows unauthenticated access to restricted pages.
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 dataApply the latest vendor firmware update for the affected router models. If no update is available, consider network segmentation or replacing the device.
- Consultation2.0 h
- Implementation1.0 h
- Testing1.0 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 $1,456.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20092 — 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-2021-20092 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