dbcve.org
Openstage 60 FirmwareOperating system · Unify

CVE-2015-8251

MEDIUM · 5.9 CVSS v3.0 Published 2017-09-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
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
OpenStage 60 and OpenScape Desk Phone IP 55G SIP V3, OpenStage 15, 20E, 20 and 40 and OpenScape Desk Phone IP 35G SIP V3, OpenScape Desk Phone IP 35G Eco SIP V3, OpenStage 60 and OpenScape Desk Phone IP 55G HFA V3, OpenStage 15, 20E, 20, and 40 and OpenScape Desk Phone IP 35G HFA V3, and OpenScape Desk Phone IP 35G Eco HFA V3 use non-unique X.509 certificates and SSH host keys.

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 OpenStage and OpenScape Desk Phone models ship with non-unique X.509 certificates and SSH host keys, meaning all devices of the same model share identical cryptographic credentials. This allows attackers to impersonate devices or conduct man-in-the-middle attacks since the certificates and keys do not uniquely identify individual devices.

MitigationReplace default shared certificates and SSH host keys with unique, device-specific certificates and keys. Implement a certificate authority (PKI) infrastructure to issue and manage unique credentials for each device, and verify that all devices now present unique certificates.

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
Openstage 60 FirmwareOperating system
Affected:= 3.0
Openscape Desk Phone Ip 55g Sip FirmwareOperating system
Affected:= 3.0
Openstage 15 FirmwareOperating system
Affected:= 3.0
Openstage 20e FirmwareOperating system
Affected:= 3.0
Openstage 20 FirmwareOperating system
Affected:= 3.0
Openstage 40 FirmwareOperating system
Affected:= 3.0
Openscape Desk Phone Ip 35g Sip FirmwareOperating system
Affected:= 3.0
Openscape Desk Phone Ip 35g Eco Sip FirmwareOperating system
Affected:= 3.0

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:H/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 checks

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

  1. Identify the phone model and firmware version
    Access the phone's web interface or admin menu to retrieve the firmware version. This is typically found under 'Status' or 'Device Information' pages.
    Affected if The firmware version is exactly 3.0 for any of the affected models: OpenStage 60, OpenStage 15, OpenStage 20e, OpenStage 20, OpenStage 40, OpenScape Desk Phone IP 55g Sip, OpenScape Desk Phone IP 35g Sip, or OpenScape Desk Phone IP 35g Eco Sip.
  2. Retrieve the device X.509 certificate
    Export the SSL/TLS certificate from the phone's web interface under 'Security' or 'Certificates' settings, or access it via the device's filesystem if administrative access is available.
    Affected if The certificate is the default shared certificate common to all devices of that model, rather than a unique certificate issued specifically for that individual device.
  3. Check if SSH is enabled and retrieve SSH host keys
    If SSH access is enabled on the device, use 'ssh-keygen -lf /etc/ssh/ssh_host_rsa_key' or similar to extract the SSH host key fingerprint. Check the phone's admin interface for SSH settings.
    Affected if SSH is enabled and the host key matches the default shared key for that specific phone model.
  4. Compare certificates across multiple devices of the same model
    If you have multiple phones of the same model, extract the X.509 certificate from each device (from the web interface or via certificate export) and compare them byte-for-byte or by certificate fingerprint.
    Affected if Two or more devices of the identical model and firmware version present byte-for-byte identical certificates, indicating they share non-unique credentials.
  5. Compare SSH host keys across multiple devices of the same model
    If SSH is enabled on multiple phones of the same model, retrieve the SSH host key from each device and compare them.
    Affected if Multiple devices of the same model share identical SSH host keys, indicating default shared keys are in use.

Your environment is affected if any of the listed phone models run firmware version 3.0 AND use the default shared certificates or SSH host keys rather than unique, device-specific credentials.

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

Replace default shared certificates and SSH host keys with unique, device-specific certificates and keys. Implement a certificate authority (PKI) infrastructure to issue and manage unique credentials for each device, and verify that all devices now present unique certificates.

Fix this in Openstage 60 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2015-8251 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