Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-20045

Cisco Unified Communications Manager Remote Code Execution

Cisco Unified Communications Manager · 12.5(1)SU2

Watch CVE-2026-20045 Browse KEV feed
Severity
CVSS 8.2 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
4.5%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-20045 is an unauthenticated vulnerability affecting Cisco Unified Communications Manager and 2 other products. A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Cisco Unified Communications Manager 12.5(1)su2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Cisco Unified Communications Manager Remote Code Execution

A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. 

This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.  Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root.

Cisco Affected
Cisco Unified Communications Manager
12.5(1)SU2 12.5(1)SU1 12.5(1) 12.5(1)SU3 12.5(1)SU4 14 12.5(1)SU5 14SU1 12.5(1)SU6 14SU2 12.5(1)SU7 12.5(1)SU7a 14SU3 12.5(1)SU8 12.5(1)SU8a 15 15SU1 14SU4 14SU4a 15SU1a 12.5(1)SU9 15SU2 15.0.1.13010-1 15.0.1.13011-1 15.0.1.13012-1 15.0.1.13013-1 15.0.1.13014-1 15.0.1.13015-1 15.0.1.13016-1 15.0.1.13017-1 15SU3a
Cisco Affected
Cisco Unified Communications Manager IM and Presence Service
12.5(1) 12.5(1)SU1 12.5(1)SU2 12.5(1)SU3 12.5(1)SU4 14 12.5(1)SU5 14SU1 12.5(1)SU6 14SU2 14SU2a 12.5(1)SU7 14SU3 12.5(1)SU8 15 15SU1 14SU4 12.5(1)SU9 15SU2 15SU3
Cisco Affected
Cisco Unity Connection
12.5(1) 12.5(1)SU1 12.5(1)SU2 12.5(1)SU3 12.5(1)SU4 14 12.5(1)SU5 14SU1 12.5(1)SU6 14SU2 12.5(1)SU7 14SU3 12.5(1)SU8 14SU3a 12.5(1)SU8a 15 15SU1 14SU4 12.5(1)SU9 15SU2 15SU3
Published
21 Jan 2026
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa edge

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-20045
  • cisco-sa-voice-rce-mORhqY4b sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CVE First 2026-06-01 10:49 UTC
CISA 2026-06-02 14:04 UTC
Daily CyberSecurity 2026-06-15 17:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.2 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS

4.5%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Control of Generation of Code ('Code Injection') CWE-94

Recent mention · Daily CyberSecurity

Cisco SD-WAN Vulnerability Exploited in the Wild: Patch CVE-2026-20262 Now

A Cisco SD-WAN vulnerability is now under active attack, and Cisco is urging customers to patch fast. Tracked The post Cisco SD-WAN Vulnerability Exploited in the Wild: Patch CVE-2026-20262 Now appeared first on Daily CyberSecurity. Related posts: Under Attack: Critical...

Read full advisory

Timeline

From disclosure to observed exploitation

  1. 17:20 UTC

    KEV confirmed by Daily CyberSecurity

    Exploitation attested by an external source

  2. 14:04 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 10:49 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. 16:26 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 11:59 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-20045

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-20045",
  "confidence": "Confirmed",
  "cvss_score": 8.2,
  "cvss_estimated": false,
  "epss_score": 0.04541,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}