Ip Phone 8821 FirmwareOperating system · Cisco
CVE-2019-1765
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 authenticated, remote attacker to write arbitrary files to the filesystem. The vulnerability is due to insufficient input validation and file-level permissions. An attacker could exploit this vulnerability by uploading invalid files to an affected device. A successful exploit could allow the attacker to write files in arbitrary locations on the filesystem. 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.
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 confidenceA vulnerability in the web-based management interface of Cisco IP Phone 8800 Series SIP Software allows authenticated remote attackers to write arbitrary files to the filesystem due to insufficient input validation and inadequate file-level permissions. The attacker exploits this by uploading invalid/malicious files to affected 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
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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.
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Identify the Cisco IP Phone modelAccess the device's web-based management interface or check the device label/BIOS info to determine if the device is an IP Phone 8821, 8821-EX, 8832, or 8800 Series modelAffected if The device model matches one of the affected product lines (8821, 8821-EX, 8832, or 8800 Series)
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Check the installed firmware versionLog into the web-based management interface and navigate to the device information or status page to view the current SIP firmware versionAffected if The firmware version is below 11.0(5) for 8821/8821-EX, or below 12.5(1)SR1 for 8832/8800 Series
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Verify the web-based management interface is accessibleAttempt to reach the device's web interface via HTTP/HTTPS from a remote location, or check if the web service is listening on the deviceAffected if The web-based management interface is enabled and reachable (this is the attack vector for this vulnerability)
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Check if remote authentication is enabledReview the web interface security settings to determine if local user authentication or remote authentication for web management is configuredAffected if Remote authentication for the web interface is enabled (an attacker needs valid credentials to exploit this vulnerability)
The device is affected if it is a Cisco IP Phone 8800 Series model (8821, 8821-EX, 8832, or 8800) running firmware versions below 11.0(5) or 12.5(1)SR1 respectively, and the web-based management interface with remote authentication is accessible.
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 other IP Phone 8800 Series models.
Fix this in Ip Phone 8821 Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,968.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1765 — 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-2019-1765 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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