Ip Phone 8821 FirmwareOperating system · Cisco
CVE-2019-1763
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 web-based management interface of Session Initiation Protocol (SIP) Software for Cisco IP Phone 8800 Series could allow an unauthenticated, remote attacker to bypass authorization, access critical services, and cause a denial of service (DoS) condition. The vulnerability exists because the software fails to sanitize URLs before it handles requests. An attacker could exploit this vulnerability by submitting a crafted URL. A successful exploit could allow the attacker to gain unauthorized access to critical services and cause a DoS condition. This vulnerability affects Cisco IP Phone 8800 Series products running a SIP Software release prior to 11.0(5) for Wireless IP Phone 8821 and 8821-EX; and 12.5(1)SR1 for the IP Conference Phone 8832 and the rest of the IP Phone 8800 Series. Cisco IP Conference Phone 8831 is not affected.
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 confidenceThis is an authorization bypass vulnerability in the web-based management interface of Cisco IP Phone 8800 Series SIP Software. The software fails to properly sanitize URLs before processing requests, allowing unauthenticated remote attackers to submit crafted URLs that bypass authorization controls and access critical services. Successful exploitation can also cause denial of 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 8821 FirmwareOperating system
< 11.0\(5\)
Ip Phone 8821 Ex FirmwareOperating system
< 11.0\(5\)
Ip Conference Phone 8832 FirmwareOperating system
< 12.5\(1\)sr1
Ip Phone 8800 FirmwareOperating system
< 12.5\(1\)sr1CVSS 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
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 device modelAccess the phone's web interface or physical device label to determine the exact model number (e.g., Cisco IP Phone 8821, 8821-EX, 8832, or 8800 Series)Affected if The device is not one of the affected models (8821, 8821-EX, 8832, or 8800 Series)
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Determine the firmware versionLog into the device's web-based management interface or use the phone's menu (Settings > Model Information > Firmware Version) to view the currently installed SIP software versionAffected if The installed firmware version matches one of the affected version ranges: 8821/8821-EX firmware < 11.0(5), or 8832/8800 firmware < 12.5(1)sr1
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Verify web-based management interface is enabledCheck the device settings under Phone Services or Web Server configuration to confirm the web-based management interface is turned onAffected if The web-based management interface is enabled - this is required for the vulnerability to be exploitable
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Confirm URL-based access attempts are possibleReview any available access logs or network traffic captures for unusual or unauthenticated URL requests targeting the device's web interfaceAffected if Unauthenticated URL requests can reach the device's web management interface without proper authorization
The device is affected if it is a Cisco IP Phone 8821, 8821-EX, 8832, or 8800 Series model running firmware versions below 11.0(5) for 8821/8821-EX or below 12.5(1)sr1 for 8832/8800, and the web-based management interface is enabled.
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 data11.012.5
Upgrade Cisco IP Phone 8800 Series devices to SIP Software version 11.0(5) or later for Wireless IP Phone 8821/8821-EX, and version 12.5(1)SR1 or later for IP Conference Phone 8832 and the rest of the 8800 Series. Cisco IP Conference Phone 8831 is not affected.
Fix this in Ip Phone 8821 Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1763 — 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-2019-1763 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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- 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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