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CVE-2021-34773— Cisco Unified Communications Products Cross-Site Request Forgery Vulnerability

Quick assessment

Affected

Cisco Cisco Unified Communications Manager

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Unified Communications Manager（CUCM，Unified CM，CallManager）是美国思科（Cisco）公司的一款统一通信系统中的呼叫处理组件。该组件提供了一种可扩展、可分布和高可用的企业IP电话呼叫处理解决方案。 Cisco Unified Communications Manager 中存在跨站请求伪造漏洞，该漏洞源于产品的管理界面的CSRF验证不足。攻击者可通过该漏洞向服务器发送非预期的请求。

CVSS 6.5 · Medium EPSS 0.50% · P42 Updated Feb 25, 2026

Possible ATT&CK Techniques 2 AI

T1053.005 · Scheduled Task T1566.002 · Spearphishing Link

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I. Basic Information for CVE-2021-34773

Vulnerability Information

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Vulnerability Title

Cisco Unified Communications Products Cross-Site Request Forgery Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability in the web-based management interface of Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack on an affected device. This vulnerability is due to insufficient CSRF protections for the web-based management interface on an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a malicious link. A successful exploit could allow the attacker to perform arbitrary actions with the privilege level of the targeted user. These actions could include modifying the device configuration and deleting (but not creating) user accounts.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

跨站请求伪造(CSRF)

Source: CVE Program / CVE List V5

Vulnerability Title

Cisco Unified Communications Manager 跨站请求伪造漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Cisco	Cisco Unified Communications Manager	n/a	-

II. Public POCs for CVE-2021-34773

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2021-34773

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Vendor Advisories for CVE-2021-34773 (1)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucm-csrf-xrTkDu3H vendor-advisory x_refsource_CISCO

https://www.cve.org/CVERecord?id=CVE-2021-34773

Same Patch Batch · Cisco · 2021-11-04 · 18 CVEs total

CVE-2021-34795	10.0 CRITICAL	Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
CVE-2021-40112	10.0 CRITICAL	Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
CVE-2021-40113	10.0 CRITICAL	Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
CVE-2021-40119	9.8 CRITICAL	Cisco Policy Suite Static SSH Keys Vulnerability
CVE-2021-34739	8.1 HIGH	Cisco Small Business Series Switches Session Credentials Replay Vulnerability
CVE-2021-34741	7.5 HIGH	Cisco Email Security Appliance Denial of Service Vulnerability
CVE-2021-40124	6.7 MEDIUM	Cisco AnyConnect Secure Mobility Client for Windows with Network Access Manager Module Pri
CVE-2021-40120	6.5 MEDIUM	Cisco Small Business RV Series Routers Command Injection Vulnerability
CVE-2021-40115	6.1 MEDIUM	Cisco Webex Video Mesh Cross-Site Scripting Vulnerability
CVE-2021-1500	5.4 MEDIUM	Cisco Webex Video Mesh Arbitrary Site Redirection Vulnerability
CVE-2021-34784	5.4 MEDIUM	Cisco Prime Infrastructure and Evolved Programmable Network Manager Stored Cross-Site Scri
CVE-2021-40128	5.3 MEDIUM	Cisco Webex Meetings Email Content Injection Vulnerability
CVE-2021-40127	5.3 MEDIUM	Cisco Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Deni
CVE-2021-34774	4.9 MEDIUM	Cisco Common Services Platform Collector Information Disclosure Vulnerability
CVE-2021-34731	4.8 MEDIUM	Cisco Prime Access Registrar Stored Cross-Site Scripting Vulnerability
CVE-2021-40126	4.3 MEDIUM	Cisco Umbrella Email Enumeration Vulnerability
CVE-2021-34701	4.3 MEDIUM	Cisco Unified Communications Products Path Traversal Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Unified Communications Manager

Same vendor: Cisco

Same weakness: CWE-352