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Ip Phone 8821 FirmwareOperating system · Cisco

CVE-2019-1716

CRITICAL · 9.8 CVSS v3.0 Published 2019-03-22
Fix available
A fix is available. Upgrade to 10.3 / 11.0 or later.
See remediation →
100/100
Remediation priority · Urgent
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
A vulnerability in the web-based management interface of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and Cisco IP Phone 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code. The vulnerability exists because the software improperly validates user-supplied input during user authentication. An attacker could exploit this vulnerability by connecting to an affected device using HTTP and supplying malicious user credentials. A successful exploit could allow the attacker to trigger a reload of an affected device, resulting in a DoS condition, or to execute arbitrary code with the privileges of the app user. Cisco fixed this vulnerability in the following SIP Software releases: 10.3(1)SR5 and later for Cisco Unified IP Conference Phone 8831; 11.0(4)SR3 and later for Cisco Wireless IP Phone 8821 and 8821-EX; and 12.5(1)SR1 and later for the rest of the Cisco IP Phone 7800 Series and 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 confidence

A vulnerability in the web-based management interface of Cisco IP Phone 7800 Series and 8800 Series allows an unauthenticated, remote attacker to inject malicious credentials via HTTP during the authentication process. The software fails to properly validate user-supplied input, enabling either a denial of service (device reload) or arbitrary code execution with the privileges of the app user.

MitigationUpgrade Cisco IP Phone firmware to the fixed releases: 10.3(1)SR5+ for 8831, 11.0(4)SR3+ for 8821/8821-EX, or 12.5(1)SR1+ for 7800/8800 Series. If immediate patching is not feasible, restrict or disable access to the web-based management interface via network segmentation or firewall rules.

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
Affected:< 11.0\(4\)sr3
Ip Phone 8821 Ex FirmwareOperating system
Affected:< 11.0\(4\)sr3
Ip Conference Phone 7800 FirmwareOperating system
Affected:< 12.5\(1\)sr1
Ip Phone 8800 FirmwareOperating system
Affected:< 12.5\(1\)sr1
Unified Ip Conferenece Phone 8831 FirmwareOperating system
Affected:< 10.3\(1\)sr5

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
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 checks

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

  1. Identify the phone model
    Locate the model number on the physical device (label on back/bottom) or via the phone's admin menu under Device > Phone. Confirm it is one of: Cisco IP Phone 8821, 8821-EX, 7800 Series, 8800 Series, or Cisco Unified IP Conference Phone 8831.
    Affected if The model is any of the listed affected series.
  2. Determine the installed firmware version
    Access the phone's web interface or admin menu and navigate to Info > Firmware Version (or similar). Compare the version number against the affected ranges: < 11.0(4)sr3 for 8821/8821-EX, < 12.5(1)sr1 for 7800/8800 Series, or < 10.3(1)sr5 for 8831.
    Affected if The installed firmware version is lower than the fixed release for your model.
  3. Confirm web-based management interface is enabled
    Access the phone's admin menu and check the security or network settings for HTTP/HTTPS web server access. Verify whether the web-based management interface is currently enabled. On some models, this appears as 'Web Server' or 'HTTP Access' in the admin settings.
    Affected if The web-based management interface is enabled and the firmware version is below the fixed release.

You are affected if your Cisco IP Phone model matches the listed series AND the installed firmware version is below the fixed release AND the web-based management interface is enabled.

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.

dbcve · scoped
Upgrade available Upgrade to 10.3 / 11.0 / 12.5 or later
Fixed in 10.311.012.5
Interim mitigation

Upgrade Cisco IP Phone firmware to the fixed releases: 10.3(1)SR5+ for 8831, 11.0(4)SR3+ for 8821/8821-EX, or 12.5(1)SR1+ for 7800/8800 Series. If immediate patching is not feasible, restrict or disable access to the web-based management interface via network segmentation or firewall rules.

Recommended fix High confidence

For Cisco IP Phone 8821/8821-EX: upgrade to 11.0(4)SR3 or later. For Cisco IP Phone 7800 Series (7832, 7841, 7851) and 8800 Series (8841, 8851, 8861, 8865): upgrade to 12.5(1)SR1 or later. For Cisco Unified IP Conference Phone 8831: upgrade to 10.3(1)SR5 or later.

  1. 1. Identify the exact Cisco IP Phone model (e.g., 8821, 8821-EX, 7832, 8841, 8831, etc.) from the device label or web interface.
  2. 2. Determine the current firmware version by accessing the device's web-based management interface or checking via the device status menu.
  3. 3. Navigate to the Cisco Software Download page (software.cisco.com) and locate the appropriate SIP firmware for your specific device model.
  4. 4. Download the required minimum fixed release: For 8821/8821-EX use 11.0(4)SR3 or later; For 8800 Series (8841, 8851, 8861, etc.) and 7800 Series (7832, 7841, 7851) use 12.5(1)SR1 or later; For 8831 Unified IP Conference Phone use 10.3(1)SR5 or later.
  5. 5. Access the device's web-based management interface and navigate to the Firmware Upgrade or Administration section.
  6. 6. Upload the downloaded firmware file to the device and initiate the upgrade process.
  7. 7. Wait for the device to complete the upgrade and reboot automatically.
  8. 8. Verify the new firmware version is installed by checking the device's about or status page.

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ip Phone 8821 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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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-2019-1716 in production — separate from our analysis above.

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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
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  • Version or environment caveats, and links to real fixes
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