Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
Published Jun 3, 2026 ·Due Jun 28, 2026
8.6
HIGHCVSS 3.1
EPSS 88.20%
Description
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elevate 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. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.
Affected products
-
- Version 14StatusaffectedConstraints-
- Version 14SU1StatusaffectedConstraints-
- Version 14SU2StatusaffectedConstraints-
- Version 14SU3StatusaffectedConstraints-
- Version 14SU4StatusaffectedConstraints-
- Version 14SU4aStatusaffectedConstraints-
- Version 14SU5StatusaffectedConstraints-
- Version 15StatusaffectedConstraints-
- Version 15.0.1.13010-1StatusaffectedConstraints-
- Version 15.0.1.13011-1StatusaffectedConstraints-
- Version 15.0.1.13012-1StatusaffectedConstraints-
- Version 15.0.1.13013-1StatusaffectedConstraints-
- Version 15.0.1.13014-1StatusaffectedConstraints-
- Version 15.0.1.13015-1StatusaffectedConstraints-
- Version 15.0.1.13016-1StatusaffectedConstraints-
- Version 15.0.1.13017-1StatusaffectedConstraints-
- Version 15SU1StatusaffectedConstraints-
- Version 15SU1aStatusaffectedConstraints-
- Version 15SU2StatusaffectedConstraints-
- Version 15SU3aStatusaffectedConstraints-
- Version 15SU4StatusaffectedConstraints-
- Version 15SU4aStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Unified Communications Manager | n/a |
|
- ≥ 14.0 · < 14su6
- ≥ 14.0 · < 14su6
- ≥ 15.0 · ≤ 15su4a
- ≥ 15.0 · ≤ 15su4a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
Date Added
Jun 25, 2026
Patch Due
Jun 28, 2026
Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Jun 25, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Jun–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 88.20% (0.88200) | 99.77th | v5 (v2026.06.15) |
| Aug 24, 2026 | 88.20% (0.88200) | 99.75th | v5 (v2026.06.15) |
| Jul 30, 2026 | 83.21% (0.83213) | 99.65th | v5 (v2026.06.15) |
| Jul 24, 2026 | 80.88% (0.80880) | 99.59th | v5 (v2026.06.15) |
| Jun 27, 2026 | 41.69% (0.41694) | 98.51th | v5 (v2026.06.15) |
| Jun 26, 2026 | 51.24% (0.51238) | 98.80th | v5 (v2026.06.15) |
| Jun 25, 2026 | 34.16% (0.34157) | 98.19th | v5 (v2026.06.15) |
| Jun 24, 2026 | 25.85% (0.25853) | 97.71th | v5 (v2026.06.15) |
| Jun 23, 2026 | 20.44% (0.20442) | 97.16th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.57% (0.00566) | 42.27th | v5 (v2026.06.15) |
| Jun 4, 2026 | 0.02% (0.00018) | 4.96th | v4 (v2025.03.14) |
References (3)
- https://denizhalil.com/2026/06/12/cve-2026-20230-cisco-unified-cm-ssrf/ exploitThird Party Advisory
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcW Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20230 government-resourceUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| https://denizhalil.com/2026/06/12/cve-2026-20230-cisco-unified-cm-ssrf/ | exploitThird Party Advisory | |
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcW | Vendor Advisory | |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20230 | government-resourceUS Government Resource |
Change history (0)
No recorded changes yet.