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Uncontrolled Resource ConsumptionWeakness · CWE-400

CVE-2026-2891

HIGH · 8.2 CVSS v4.0 Published 2026-07-01
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
91/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 8 weeks old

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
The following Poly Voice IP devices, CCX, Trio, and Edge E, might be inoperable if they connect to a malicious SIP server and receive malformed data. HP is releasing updates to mitigate these potential vulnerabilities.

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 confidence

Denial-of-service vulnerability in Poly Voice IP devices (CCX, Trio, and Edge E) where connecting to a malicious SIP server and receiving malformed SIP data can render the devices inoperable.

MitigationApply HP-released firmware updates to affected Poly devices; until patches are available, avoid connecting devices to untrusted SIP servers.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 Poly voice devices in your environment
    Review network device inventory or physically inspect IP phones, conference phones, and endpoints for Poly branding. Look for CCX series phones, Trio conference phones, or Edge E devices.
    Affected if You have Poly CCX, Trio, or Edge E devices deployed
  2. Check firmware version on Poly devices
    Access the device admin web interface or use SNMP/SSH to query the device. Navigate to Settings > System Information or run 'show version' via CLI. Compare the firmware version against any HP-released updates for this CVE.
    Affected if Firmware version is older than the patched release (specific version numbers not provided in CVE data)
  3. Review SIP server configurations
    Access device admin settings and navigate to SIP or telephone account settings. Identify all configured SIP proxy/registrar servers.
    Affected if Devices are configured to connect to SIP servers that are not verified as trusted
  4. Verify network exposure to untrusted SIP servers
    Check firewall rules and network segmentation. Determine if Poly devices can initiate outbound connections to SIP servers on ports 5060/5061 that you do not control or trust.
    Affected if Devices can reach untrusted or public SIP servers from your network

Your environment is affected if you have Poly CCX, Trio, or Edge E devices running firmware older than the patched version AND those devices can connect to untrusted SIP servers.

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

Apply HP-released firmware updates to affected Poly devices; until patches are available, avoid connecting devices to untrusted SIP servers.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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Scan for this in your stack

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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-2026-2891 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