Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2026-20230

Cisco Unified Communications Manager Server Side Request Forgery Vulnerability Server-Side Request Forgery

Cisco Unified Communications Manager · 14

Watch CVE-2026-20230 Browse KEV feed
Severity
CVSS 8.6 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
88.2%
First observed
25 Jun 2026
Last observed
30 Jul 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-20230 is an unauthenticated vulnerability affecting Cisco Unified Communications Manager. A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Cisco Unified Communications Manager 14.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Cisco Unified Communications Manager Server Side Request Forgery Vulnerability Server-Side Request Forgery

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.

Cisco Affected
Cisco Unified Communications Manager
14 14SU1 14SU2 14SU3 15 15SU1 14SU4 14SU4a 15SU1a 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 14SU5 15SU4 15SU4a
Published
03 Jun 2026
Exploitation Reported
23 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

edge cisa

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-20230
  • cisco-sa-cucm-ssrf-cXPnHcW 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

BleepingComputer

Recorded 23 Jun 2026

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 25 Jun 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Proof of concept available

GitHub

Recorded 05 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

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

Learn about Pro API access
Source Added
BleepingComputer First 2026-06-23 22:20 UTC
The Hacker News 2026-06-24 08:20 UTC
CISA 2026-06-25 00:00 UTC
Previdian Sensors 2026-06-25 02:35 UTC
CVE 2026-06-25 20:10 UTC
All CISA Advisories 2026-06-25 21:20 UTC
The Shadowserver 2026-07-10 00:00 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

606

Attempts observed

1

Unique attacker IPs

1

Attacker countries

RO

1

Sensors observed

CVE-2026-20230 exploitation attempts over the last 90 days

Daily events observed by Previdian sensors

Updated 10 Oct 2026

0
48
542
10
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6
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0
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0
0
0
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0
0
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0
0
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0
13 Jul 31 Jul 18 Aug 5 Sep 10 Oct

First observed 25 Jun 2026 · Last observed 30 Jul 2026

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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
2

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

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

Previdian virtual patch guidance is available for this CVE.

AWS WAF Cloudflare ModSecurity

Indicators of Compromise (IoCs)

Operational indicators linked to exploitation of this CVE. IoCs age over time, especially IP addresses.

Export
Type Indicator First Seen Last Seen Age Source
File hash Stale f96d3df92d9dd8651d0314c9742f5252

MD5

KEVIntel has identified a payload being downloaded during exploitation of Cisco Unified Communications Manager SSRF: Binary: gpg-bus Install path: ~/.local/.agent/ MD5: f96d3df92d9dd8651d0314c9742f5252

 2026-06-26 15:15 UTC 2026-06-26 15:15 UTC 4 months ago —

Virtual Patch Detail

Compensating WAF rules for this CVE.

Available

Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to Previdian Enterprise users.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.6 High

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

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

EPSS

88.2%

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

Weaknesses

Server-Side Request Forgery (SSRF) CWE-918

Recent mention · All CISA Advisories

CISA Adds Two Known Exploited Vulnerabilities to Catalog

CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.   CVE-2026-12569 PTC Windchill and FlexPLM Improper Input Validation Vulnerability CVE-2026-20230 Cisco Unified Communications Manager...

Read full advisory

All Mentions

Recent mention · All CISA Advisories

CISA Adds Two Known Exploited Vulnerabilities to Catalog

All CISA Advisories · 25 Jun 2026

CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.   CVE-2026-12569 PTC Windchill and FlexPLM Improper Input Validation Vulnerability CVE-2026-20230 Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements...

Recent mention · TheRegister

The hits keep on coming for Cisco vulnerabilities

TheRegister · 24 Jun 2026

CVE-2026-20230 under exploitation, while an earlier SD-WAN 0-day looks even worse than we thought

Recent mention · The Hacker News

Cisco Unified CM Flaw Exploited After PoC Reveals File-Write Path to Root

The Hacker News · 24 Jun 2026

Threat actors have begun to exploit a recently disclosed critical security flaw impacting Cisco Unified Communications Manager (Unified CM) and Unified Communications Manager Session Management Edition (Unified CM SME). The vulnerability, tracked as CVE-2026-20230 (CVSS score: 8.6), is a case of improper input validation for specific HTTP requests that could allow an unauthenticated, remote

Recent mention · BleepingComputer

Cisco Unified CM flaw CVE-2026-20230 now exploited in attacks

BleepingComputer · 23 Jun 2026

A high-severity SSRF vulnerability, tracked as CVE-2026-20230, in Cisco Unified Communications Manager Server is now being exploited in attacks. [...]

Recent mention · The Hacker News

Cisco Patches CVE-2026-20230 in Unified CM as Exploit Code Goes Public

The Hacker News · 04 Jun 2026

Cisco has patched a bug in Unified Communications Manager that lets an unauthenticated attacker on the network write files to the box and, from there, climb to root. It is tracked as CVE-2026-20230, and proof-of-concept exploit code is already public. Cisco's PSIRT says it has not seen the flaw used in attacks yet. The PoC shortens that runway. The flaw is a server-side request forgery.

Recent mention · DarkWebInformer

SSRF to Root: Unauthenticated File-Write Flaw in Cisco Unified CM (CVE-2026-20230)

DarkWebInformer · 04 Jun 2026

CVE-2026-20230 is an unauthenticated, remote server-side request forgery (SSRF) vulnerability in Cisco Unified Communications Manager (Unified CM) and Unified CM Session Management Edition (Unified CM SME).

Recent mention · Cisco Security Advisory

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

Cisco Security Advisory · 03 Jun 2026

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...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

CVE Record exploit — denizhalil.com

cve · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 18:30 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 00:00 UTC

    KEV confirmed by The Shadowserver

    Exploitation attested by an external source

  3. 21:20 UTC

    KEV confirmed by All CISA Advisories

    Exploitation attested by an external source

  4. 20:10 UTC

    KEV confirmed by CVE

    Exploitation attested by an external source

  5. 10:00 UTC

    Virtual patch available

    Compensating WAF rule available to block exploitation

  6. 02:30 UTC

    Indicators of compromise added (25)

    Indicators of compromise recorded

  7. 02:30 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  8. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  9. 08:20 UTC

    KEV confirmed by The Hacker News

    Exploitation attested by an external source

  10. 22:20 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  11. 16:09 UTC

    CVE published

    Vulnerability disclosed publicly

  12. 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
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  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-20230

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-20230",
  "confidence": "Confirmed",
  "cvss_score": 8.6,
  "cvss_estimated": false,
  "epss_score": 0.882,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 606, "sensors": 1 }
}