CVE-2026-20230Known exploitationPublic exploitNetwork attack vector

Unauthenticated file write via WebDialer SSRF

Published Jun 3, 2026 · Updated Jun 3, 2026

SSRF in Cisco Unified Communications Manager releases 14 and 15 allows remote attackers to write files via crafted WebDialer HTTP requests. The WebDialer service inadequately validates input in specific HTTP requests before processing it, allowing crafted requests to trigger server-side file writes. WebDialer must be enabled, although it is disabled by default; successful exploitation creates files that can later support elevation to root.

CVSS severity8.6
High
EPSS probability88.20%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Cisco Unified Communications Manager releases 14 and 15 allows remote attackers to write files via crafted WebDialer HTTP requests. The WebDialer service inadequately validates input in specific HTTP requests before processing it, allowing crafted requests to trigger server-side file writes. WebDialer must be enabled, although it is disabled by default; successful exploitation creates files that can later support elevation to root.

The record

CVE
CVE-2026-20230
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
ClamAV
Product
Cisco Unified Communications Manager
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2026Record updatedLatest update available in the CVE record.
  3. Jun 25, 2026Exploitation reportedCISA Known Exploited Vulnerabilities entry

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=N/A

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Unified Communications Managerversion=N/A

Published CVSS scores

8.6Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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