SecOps SignalSecurity Intelligence Workspace
Loading collection status
Vulnerabilities/CVE-2026-20034Public Intelligence Dossier
Source: cisco · Limited verification•Last verified: •Collection Degraded
CVE-2026-20034Unknown / EvaluatingHIGH (raw)CVSS 8.8CWE-35

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device

Published: 06 May 2026•Last updated: 27 Oct 2026, 12:40 AM IST•Source identifier: psirt@cisco.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
8.8HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Metric sourcepsirt@cisco.com
EPSS probability
0.7%0.007
Percentile54th
Weakness type
CWE-35
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of a targeted device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.

SOC priority

High

Actively exploited (source statement)

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; HIGH severity; Source severity; no confirmed exploitation signal

Affected Products & Remediation

1 source-backed product
Affected products and versions (source)
  • cisco unity connection · < 14.0; 14.0; 14su1; 14su2; 14su3; 14su4; 15.0; 15su1; 15su2; 15su3 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched path-traversal (CWE-35)

Exposure

  1. Locate affected deployments and the path-handling endpoint named by the advisory.Telemetry: Application access logs · The affected path must come from the source, not the CWE alone. · Rule path-traversal

Exploitation evidence

  1. Review requests to that endpoint for traversal encodings and unusual file responses.Telemetry: Application access logs · Such patterns are a hypothesis to validate against normal traffic. · Rule path-traversal

Response

  1. Verify the source-stated fix and retest the affected path.Telemetry: Application change records · The exact remediation depends on the source advisory. · Rule path-traversal

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
psirt@cisco.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:14.0:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:14su1:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:14su2:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:14su3:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:14su4:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:15.0:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:15su1:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:15su2:*:*:*:*:*:*:*, cpe:2.3:a:cisco:unity_connection:15su3:*:*:*:*:*:*:*

Evidence & Provenance

2 public sources
sec.cloudapps.cisco.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-20034
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-20034
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-20034"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Looking up related community queries…

Loading related intelligence

Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.