Ip Phone 8800 Series FirmwareOperating system · Cisco
CVE-2017-6630
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 in the Session Initiation Protocol (SIP) implementation of Cisco IP Phone 8851 11.0(0.1) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to an abnormal SIP message. An attacker could exploit this vulnerability by manipulating the CANCEL packet. An exploit could allow the attacker to cause a disruption of service to the phone. Cisco Bug IDs: CSCvc34795.
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 vulnerability exists in the SIP implementation of Cisco IP Phone 8851 firmware 11.0(0.1). The issue stems from improper handling of abnormal SIP messages, specifically manipulated CANCEL packets. An unauthenticated remote attacker can send specially crafted CANCEL packets to cause a denial of service, disrupting phone service.
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
Ip Phone 8800 Series FirmwareOperating system
= 11.0\(0.1\)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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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 the phone modelAccess the phone's web interface or menu to confirm the model is Cisco IP Phone 8851 or another 8800 series model. On the phone, press Applications > Phone Information > Model Number.Affected if Model is Cisco IP Phone 8851 or other 8800 series phones
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Check the firmware versionNavigate to the phone's web interface > Device Information > Firmware Version, or on the physical phone go to Applications > Phone Information > Firmware Version. Confirm the exact version string.Affected if Firmware version is exactly 11.0(0.1)
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Verify SIP protocol is enabledAccess the phone's web interface > User Login > Admin Login > Advanced > SIP Settings. Check if SIP Proxy or SIP Transport is configured and enabled.Affected if SIP is enabled and configured on the phone (vulnerability only applies when SIP is active)
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Check SIP port exposureReview network configuration to determine if UDP/TCP port 5060 (SIP) is listening on interfaces accessible from untrusted networks. Check firewall rules and VLAN placement.Affected if SIP port 5060 is exposed to external or untrusted networks without filtering
Affected if the phone model is Cisco IP Phone 8851 (or 8800 series) running firmware version exactly 11.0(0.1) with SIP enabled and accessible to network 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 dataApply the vendor patch or upgrade Cisco IP Phone 8851 firmware to a version beyond 11.0(0.1) that addresses Cisco Bug ID CSCvc34795. If immediate patching is not possible, consider SIP traffic filtering or network segmentation to limit exposure to malicious CANCEL packets.
Fix this in Ip Phone 8800 Series Firmware
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-6630 — 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-2017-6630 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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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
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