CVE-2025-20309

criticalpriority · track · 0OT risk · elevatedEPSS 0.012 · 68 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.19% (68th) EPSS

CVSS 10 · critical

Is it mine?

30 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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 log in to an affected device using the root account, which has default, static credentials that cannot be changed or deleted. This vulnerability is due to the presence of static user credentials for the root account that are reserved for use during development. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and execute arbitrary commands as the root user.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Unified Communications Managercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.110criticalAV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · ENISA EU

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · psirt@cisco.com USexploitability 3.9 · impact 6

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · NCSC-NL NL

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USCWE-798USCWE-798US

affected products (30)

Products and version ranges known to be affected.

Cisco Unified Communications Manager (CUCM) 15.0.1.13010-1-15.0.1.13017-1all versionscert_bundDEcpe:/a:cisco:unified_communications_manager:15.0.1.13010-1_-_15.0.1.13017-1
Cisco Unified Communications Manager (CUCM) <15SU3all versionscert_bundDE
Cisco Unified Communications Manager (CUCM)< 15SU3cert_bundDE
Cisco Cisco Unified Communications Managerall versionscisco_csafUS
Cisco Cisco Unified Communications Manager≤ 15.0.1.13010-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13012-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13016-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13014-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13013-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13017-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13011-1enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 15.0.1.13015-1enisa_euvdEU
Cisco Systems Inc. Cisco Unified Communications Manager15.0.1.13010-1 → 15.0.1.13017-1fstec_bduRU
Cisco Systems Inc. Cisco Unified Communications Manager SME15.0.1.13010-1 → 15.0.1.13017-1fstec_bduRU
Cisco Cisco Unified Communications Manager≤ vers:unknown/15.0.1.13011-1ncsc_nlNL
Cisco Cisco Unified Communications Manager≤ vers:unknown/15.0.1.13012-1ncsc_nlNL
Cisco Cisco Unified Communications Manager≤ vers:unknown/15.0.1.13013-1ncsc_nlNL
Cisco Cisco Unified Communications Manager≤ vers:unknown/15.0.1.13014-1ncsc_nlNL
Cisco Cisco Unified Communications Manager≤ vers:unknown/15.0.1.13015-1ncsc_nlNL
Cisco Cisco Unified Communications Manager≤ vers:unknown/15.0.1.13016-1ncsc_nlNL

showing 20 of 30

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2025-0210Kwetsbaarheid verholpen in Cisco Unified Communications ManagerNL2025-07-03csaf · ncsc_nlNL
Cisco heeft een kwetsbaarheid verholpen in Cisco Unified Communications Manager (en Cisco Unified Communications Manager Session Management Edition).
WID-SEC-W-2025-1448Cisco Unified Communications Manager (CUCM): Schwachstelle ermöglicht Erlangen von AdministratorrechtenDeutsch2025-07-02csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco Unified Communications Manager (CUCM) ausnutzen, um Administratorrechte zu erlangen.
cisco-sa-cucm-ssh-m4UBdpE7Cisco Unified Communications Manager Static SSH Credentials Vulnerability2025-07-02csaf · cisco_csafUS
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 log in to an affected device using the root account, which has default, static credentials that cannot be changed or deleted. This vulnerability is due to the presence of static user credentials for the root account that are reserved for use during development. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and execute arbitrary commands as the root user. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisco_csaf ncsc_nl NVD CVE.org MITRE

published 2025-07-02modified 2026-06-17

references (3)

External citations — patches, advisories, analysis.

scry

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