CVE-2026-20045

criticalpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.045 · 92 %ileexploit · PoCDEEUNLRUUS
grimoire priorityP0 · Act now
Exploitable?
Yes · in the wild
CISA KEV · 1 exploit · PoC
Likely / severe?
4.54% (92nd) EPSS
CVSS 9.8 · critical
Is it mine?
146 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2026-01-21remediate by 2026-02-11

required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS · scored 2026-10-25

Cisco Unified Communications Products Code Injection Vulnerability

A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device.  This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges 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.

01

remediations

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

A vendor fix is available.

02

cvss

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

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.2–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · ENISA EU
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · psirt@cisco.com USexploitability 3.9 · impact 4.2
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · NCSC-NL NL
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · Cisco PSIRT US
03

ssvc

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

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94USCWE-94USCWE-94US
05

exploits (1)

Public proof-of-concept and weaponised exploit code.

06

affected products (146)

Products and version ranges known to be affected.

showing 20 of 146
07

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0036Kwetsbaarheden verholpen in Cisco Unified Communications productenNL2026-01-22csaf · ncsc_nlNL

    Cisco heeft kwetsbaarheden verholpen in verschillende Cisco Unified Communications producten.

  • WID-SEC-W-2026-0192Cisco Unified Communications Manager, Unified Communications Manager IM & Presence Service und Unity Connection: Schwachstelle ermöglicht CodeausführungDeutsch2026-01-21csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco Unified Communications Manager (CUCM), Cisco Unified Communications Manager IM & Presence Service und Cisco Unity Connection ausnutzen, um beliebigen Programmcode auszuführen.

  • cisco-sa-voice-rce-mORhqY4bCisco Unified Communications Products Remote Code Execution Vulnerability2026-01-21csaf · cisco_csafUS

    A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges 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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

08

also known as (4)

Other names and identifiers for this entity.

09

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundcisco_csafncsc_nlNVDCVE.orgMITRE
published 2026-01-21modified 2026-06-17
10

references (6)

External citations — patches, advisories, analysis.

scry

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