Unity ConnectionApplication · Cisco
CVE-2026-20081
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 · uneditedMultiple vulnerabilities in Cisco Unity Connection could allow an authenticated, remote attacker to download arbitrary files from an affected system. To exploit these vulnerabilities, the attacker must have valid administrative credentials. These vulnerabilities are due to improper sanitization of user input to the web-based management interface. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request. A successful exploit could allow the attacker to download arbitrary files from an affected system.
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 confidenceMultiple vulnerabilities in Cisco Unity Connection allow an authenticated remote attacker with administrative credentials to download arbitrary files from the affected system. The vulnerabilities stem from improper sanitization of user input in the web-based management interface, exploited via crafted HTTPS requests.
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
Unity ConnectionApplication
<= 12.5= 14.0= 14su1= 14su2= 14su3= 14su3a= 14su4= 14su5= 15.0= 15su1= 15su2= 15su3CVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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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Confirm Cisco Unity Connection is installedCheck if the product exists on the system by logging into the Cisco Unified Communications Manager administration interface or running 'show version' on the CLI. Cisco Unity Connection is typically deployed as part of the Cisco UC platform.Affected if The product is not present in the environment, the vulnerability does not apply.
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Identify the installed versionAccess the Cisco Unity Connection administration web interface and navigate to About or System Settings, or use the CLI command 'show version' to retrieve the exact version number.Affected if The installed version matches any of these: 12.5 or lower; 14.0; 14su1; 14su2; 14su3; 14su3a; 14su4; 14su5; 15.0; 15su1; 15su2; 15su3.
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Verify web-based management interface is enabledConfirm the Cisco Unity Connection web-based management interface (HTTPS) is accessible and operational. This is the attack vector for this vulnerability.Affected if The web interface is disabled and there is no HTTPS access to Unity Connection administration, the exploit cannot be used.
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Check for administrative user accountsReview the list of administrative users in Cisco Unity Connection administration under User Management > Administrators. The attacker requires valid administrative credentials.Affected if No administrative accounts exist or none are active, the vulnerability cannot be exploited despite being present.
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Inspect for unusual file download activityReview web server logs and audit trails for the Unity Connection web interface for patterns of suspicious file download requests, especially those with path traversal sequences.Affected if Evidence of arbitrary file download requests from the web interface indicates active exploitation.
A user is affected if Cisco Unity Connection is installed with a version matching the affected list, the web-based management interface is enabled, and administrative credentials are present in the system.
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-provided security patches for Cisco Unity Connection. Restrict access to the web-based management interface to trusted networks or VPN-only access, and ensure administrative credentials are strong and rotated regularly.
Fix this in Unity Connection
Scoped from the published advisory
- Consultation4.0 h
- Implementation4.0 h
- Testing3.0 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 $3,728.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20081 — 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-2026-20081 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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