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Bbr 4hg FirmwareApplication · Buffalotech

CVE-2011-1324

MEDIUM · 5.8 CVSS v2.0 Published 2011-05-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
67/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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
Multiple cross-site request forgery (CSRF) vulnerabilities in the management screen on Buffalo WHR, WZR2, WZR, WER, and BBR series routers with firmware 1.x; BHR-4RV and FS-G54 routers with firmware 2.x; and AS-100 routers allow remote attackers to hijack the authentication of administrators for requests that modify settings, as demonstrated by changing the login password.

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 · high confidence

Multiple CSRF vulnerabilities in Buffalo router management interfaces allow remote attackers to hijack authenticated administrator sessions, enabling unauthorized modification of device settings such as changing the login password. The vulnerability affects multiple router series (WHR, WZR2, WZR, WER, BBR, BHR-4RV, FS-G54, AS-100) across specific firmware versions.

MitigationRestrict access to the router's web management interface to trusted networks only, or implement network segmentation to prevent external attackers from reaching the admin interface. Since this is a firmware-level issue, contact Buffalo for available patches or consider replacing end-of-life devices.

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
Bbr 4hg FirmwareApplication
Affected:= 1.02= 1.04= 1.10= 1.11= 1.12= 1.20= 1.30= 1.31= 1.32= 1.33
Bbr 4mg FirmwareApplication
Affected:= 1.00= 1.01= 1.03= 1.04= 1.10= 1.11= 1.12= 1.20= 1.30= 1.31= 1.32= 1.33
Bhr 4rv FirmwareApplication
Affected:= 2.31= 2.32= 2.33= 2.42= 2.46= 2.48
Fs G54 FirmwareApplication
Affected:= 2.07
Wer A54g54 FirmwareApplication
Affected:= 1.00= 1.01= 1.02= 1.03= 1.10= 1.12= 1.13
Wer Ag54 FirmwareApplication
Affected:= 1.04= 1.12
Wer Am54g54 FirmwareApplication
Affected:= 1.11= 1.12= 1.13= 1.14
Wer Amg54 FirmwareApplication
Affected:= 1.11= 1.12= 1.14

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
M
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:N/I:P/A:P

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify router model and firmware version
    Access the router's web management interface (typically at 192.168.1.1 or similar) and navigate to the status or system information page to view the exact firmware version installed. Alternatively, check the physical device label or documentation.
    Affected if The displayed firmware version matches one of the versions listed in the affected products and versions for your specific router model.
  2. Confirm web management interface is enabled
    Check the router's administration settings to verify that the HTTP or HTTPS management interface is enabled. This is typically found under 'Administration', 'Management', or 'System' settings.
    Affected if The web-based management interface is enabled and accessible.
  3. Determine network exposure of management interface
    Check the router's WAN or internet settings to see if remote management/administration from external networks is permitted. Look for settings like 'Remote Management', 'Web Access from WAN', or 'External Admin Access'.
    Affected if The management interface is accessible from WAN/outside networks or untrusted networks, not restricted to the local LAN only.
  4. Verify admin session vulnerability potential
    This is a CSRF vulnerability. If the router has an active admin session and the management interface is accessible to an attacker, the router settings can be modified without the admin's knowledge via malicious requests.
    Affected if The router meets all previous conditions: affected firmware version, web management enabled, and accessible to potential attackers.

You are affected if your Buffalo router model and installed firmware version match one of the specific versions listed and the router's web management interface is enabled and accessible to untrusted networks.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Restrict access to the router's web management interface to trusted networks only, or implement network segmentation to prevent external attackers from reaching the admin interface. Since this is a firmware-level issue, contact Buffalo for available patches or consider replacing end-of-life devices.

Fix this in Bbr 4hg Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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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 sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-1324 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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