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CVE-2026-20045: Cisco Unified Communications Manager Vulnerability Guide

Severity: Critical (CVSS 8.2)
Impact: Remote Code Execution (RCE) via arbitrary command injection.
 

Vulnerability Overview

Cisco has officially reported a high-risk vulnerability affecting a wide array of telecommunications and voice management products. This flaw enables an unauthenticated remote attacker to gain administrative control by executing system-level commands on vulnerable hosts.

Affected Products:

  • Cisco Unified Communications Manager (CUCM)
  • CUCM Session Management Edition
  • CUCM IM & Presence Service
  • Cisco Unity Connection
  • Cisco Dedicated Webex Calling Instances

Impact and Scope

Confirmed Vulnerable Versions: 12.5, 14.x, and 15.x.
Note: Legacy versions are also considered potentially vulnerable and should be evaluated immediately.

If successfully exploited, an adversary can execute commands with the privileges of the underlying operating system, potentially leading to unauthorized data access, service disruption, or full network pivot.

Remediation and Patches

Cisco has confirmed that no workarounds are currently available. Security teams must take the following actions:

  • For Version 12.5 and older: Upgrade immediately to a supported, fixed release.
  • For Versions 14.x and 15.x: Apply the specific security patches detailed in the vendor’s official advisory.

Locating Vulnerable Assets with runZero

To identify potentially exposed systems within your environment, navigate to the Software inventory and execute the following search query:

vendor:=Cisco AND product:="Unified Communications Manager"[Insert Query Here]

About runZero
runZero, a network discovery and asset inventory solution, was founded in 2018 by HD Moore, the creator of Metasploit. HD envisioned a modern active discovery solution that could find and identify everything on a network–without credentials. As a security researcher and penetration tester, he often employed benign ways to get information leaks and piece them together to build device profiles. Eventually, this work led him to leverage applied research and the discovery techniques developed for security and penetration testing to create runZero.

About Version 2 Digital

Version 2 Digital is one of the most dynamic IT companies in Asia. The company distributes a wide range of IT products across various areas including cyber security, cloud, data protection, end points, infrastructures, system monitoring, storage, networking, business productivity and communication products.

Through an extensive network of channels, point of sales, resellers, and partnership companies, Version 2 offers quality products and services which are highly acclaimed in the market. Its customers cover a wide spectrum which include Global 1000 enterprises, regional listed companies, different vertical industries, public utilities, Government, a vast number of successful SMEs, and consumers in various Asian cities.

EPM 策略:如何攔截基於特權的攻擊

核心洞察

  • 大多數端點入侵成功的原因在於特權濫用,而非技術性漏洞。
  • 身分是新的防禦邊界;端點特權是攻擊者橫向移動的「核心目標」。
  • 端點特權管理 (EPM) 可對特權在運行時「如何」及「何時」被使用進行精細控制。

六大主要的特權攻擊向量

攻擊者依賴過度授權與管理盲點來推進其目標。常見技術包括:

本地特權提升 (LPE)
利用漏洞從標準使用者帳戶提升至完整的管理員存取權限。
憑證竊取
從記憶體中提取憑證(如使用 Mimikatz),以便跨系統冒充使用者。
離地攻擊 (LotL)
濫用 PowerShell 和 WMI 等受信任的系統工具,在不被察覺的情況下執行惡意操作。
濫用本地管理員權限
透過受侵害的管理員帳戶,獲得對系統設定和敏感數據的無限制控制權。
無檔案與腳本攻擊
利用提升的權限直接在記憶體中執行惡意代碼,規避磁碟鑑識。
應用程式誤用
利用受信任的應用程式情境,透過修改過的二進位檔案繞過安全控制。

由 Segura® EPM 驅動的防禦模型

Segura® EPM 與零信任原則完全對齊,確保每一項特權操作都經過驗證與監控。

防禦維度Segura® EPM 能力預期成效
本地管理員權限消除永久性管理員身分;將存取轉化為受監控的提升請求。大幅減少攻擊面,中斷勒索軟體傳播。
即時 (JIT) 提升僅針對特定任務授予臨時特權,並在完成後自動過期。抵銷攻擊者對持續性特權的依賴。
應用程式控制動態白名單防止未經授權的腳本和二進位檔案以高權限執行。阻斷離地攻擊 (LotL) 和 DLL 側載。
SOC 可視化將提升嘗試與異常模式的即時遙測數據發送至 SIEM/XDR。將特權濫用轉化為高保真度的偵測訊號。

保護機器身分

服務帳戶和機器身分經常被忽視,卻是常見的橫向移動向量。Segura® 對自動化工具實施最小權限原則,防止機器令牌被利用於特權提升。

結論

在混合與 SaaS 主導的環境中,傳統的 EPP 和防毒軟體已不足夠。Segura® 端點特權管理透過將特權從弱點轉化為受控、可審計且具韌性的安全資產,提供關鍵的防禦層。

探索 Segura® EPM

在不中斷營運的情況下減少本地管理員風險,支援零信任策略。

關於 Segura®

Segura® 致力於確保企業對其特權操作與資訊的自主掌控。為此,我們透過追蹤管理者在網絡、伺服器、資料庫及眾多裝置上的操作,有效防範資料竊取。此外,我們也協助企業符合稽核要求及最嚴格的標準,包括 PCI DSS、沙賓法案(Sarbanes-Oxley)、ISO 27001 及 HIPAA。

關於Version 2

Version 2 Digital 是立足亞洲的增值代理商及IT開發者。公司在網絡安全、雲端、數據保護、終端設備、基礎設施、系統監控、存儲、網絡管理、商業生產力和通信產品等各個領域代理發展各種 IT 產品。透過公司龐大的網絡、通路、銷售點、分銷商及合作夥伴,Version 2 提供廣被市場讚賞的產品及服務。Version 2 的銷售網絡包括台灣、香港、澳門、中國大陸、新加坡、馬來西亞等各亞太地區,客戶來自各行各業,包括全球 1000 大跨國企業、上市公司、公用事業、醫療、金融、教育機構、政府部門、無數成功的中小企及來自亞洲各城市的消費市場客戶。

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