CVE-2023-20266

highpriority · track · 29EPSS 0.005 · 42 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.49% (42nd) EPSS

CVSS 7.2 · high

Is it mine?

31 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in Cisco Emergency Responder, Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unity Connection could allow an authenticated, remote attacker to elevate privileges to root on an affected device. This vulnerability exists because the application does not properly restrict the files that are being used for upgrades. An attacker could exploit this vulnerability by providing a crafted upgrade file. A successful exploit could allow the attacker to elevate privileges to root. To exploit this vulnerability, the attacker must have valid platform administrator credentials on an affected device.

remediations

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

A vendor fix is available.

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

cvss

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

7.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.2

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.2 · impact 5.9

v3.16.5mediumAV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · psirt@cisco.com USexploitability 1.2 · impact 5.2

v3.16.6mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · Cisco PSIRT US

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269USprimaryCWE-264USCWE-347US

affected products (31)

Products and version ranges known to be affected.

Cisco Cisco Emergency Responderall versionscisco_csafUS
Cisco Cisco Unified Communications Managerall versionscisco_csafUS
Cisco Cisco Unity Connectionall versionscisco_csafUS
Cisco Cisco Emergency Responder≤ 12.5(1)SU8aenisa_euvdEU
Cisco Cisco Emergency Responder≤ 14SU3enisa_euvdEU
Cisco Cisco Emergency Responder≤ 12.5(1)SU4enisa_euvdEU
Cisco Cisco Unified Communications Manager≤ 12.5(1)SU8enisa_euvdEU
Cisco Cisco Unity Connection≤ 12.5(1)SU7enisa_euvdEU
Cisco Cisco Unity Connection≤ 14SU3enisa_euvdEU
Cisco Cisco Unity Connection≤ 12.5(1)SU8enisa_euvdEU
Cisco Cisco Unity Connection≤ 12.5(1)SU6enisa_euvdEU
Cisco Cisco Unity Connection≤ 14SU2enisa_euvdEU
Cisco Systems Inc. Cisco Emergency Responder≤ 12.5.1SU8afstec_bduRU
Cisco Systems Inc. Cisco Emergency Responder≤ 12.5.1SU4fstec_bduRU
Cisco Systems Inc. Cisco Emergency Responder≤ 14SU3fstec_bduRU
Cisco Systems Inc. Cisco Unified Communications Manager≤ 12.5.1SU8fstec_bduRU
Cisco Systems Inc. Cisco Unified Communications Manager SME≤ 12.5.1SU8fstec_bduRU
Cisco Systems Inc. Unity Connection≤ 12.5.1SU6fstec_bduRU
Cisco Systems Inc. Unity Connection≤ 14SU3fstec_bduRU
Cisco Systems Inc. Unity Connection≤ 14SU2fstec_bduRU

showing 20 of 31

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2233Cisco Unity Connection and Cisco Unified Communications Manager (CUCM): Schwachstelle ermöglicht PrivilegieneskalationDeutsch2023-08-30csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Cisco Unity Connection und Cisco Unified Communications Manager (CUCM) ausnutzen, um seine Privilegien zu erhöhen.
cisco-sa-cucm-priv-esc-D8Bky5egCisco Unified Communications Products Privilege Escalation Vulnerability2023-08-30csaf · cisco_csafUS
A vulnerability in Cisco Emergency Responder, Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unity Connection could allow an authenticated, remote attacker to elevate privileges to root on an affected device. This vulnerability exists because the application does not properly restrict the files that are being used for upgrades. An attacker could exploit this vulnerability by providing a crafted upgrade file. A successful exploit could allow the attacker to elevate privileges to root. To exploit this vulnerability, the attacker must have valid platform administrator credentials on an affected device. 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 cisco_csaf cert_bund NVD CVE.org MITRE

published 2023-08-30modified 2026-06-17

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references (5)

External citations — patches, advisories, analysis.

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