CVE-2021-34715— Cisco Expressway Series and TelePresence Video Communication Server Image Verification Vulnerability
Quick assessment
Affected
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway
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 Expressway Series和Cisco TelePresence Video Communication Server（VCS）都是美国思科（Cisco）公司的产品。Cisco Expressway Series是一款用于防火墙外访问设备的软件。该软件为防火墙外的用户提供了简单、高度安全的访问功能，帮助远程办公人员在他们选择的设备上更有效地工作。Cisco TelePresence Video Communication Server是一款视频通信服务器。 Cisco Expressw
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2021-34715
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Cisco Expressway Series and TelePresence Video Communication Server Image Verification Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the image verification function of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to execute code with internal user privileges on the underlying operating system. The vulnerability is due to insufficient validation of the content of upgrade packages. An attacker could exploit this vulnerability by uploading a malicious archive to the Upgrade page of the administrative web interface. A successful exploit could allow the attacker to execute code with user-level privileges (the _nobody account) on the underlying operating system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Expressway Series和Cisco TelePresence Video Communication Server 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Expressway Series和Cisco TelePresence Video Communication Server（VCS）都是美国思科（Cisco）公司的产品。Cisco Expressway Series是一款用于防火墙外访问设备的软件。该软件为防火墙外的用户提供了简单、高度安全的访问功能，帮助远程办公人员在他们选择的设备上更有效地工作。Cisco TelePresence Video Communication Server是一款视频通信服务器。 Cisco Expressw
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 TelePresence Video Communication Server (VCS) Expressway | n/a | - |
|
II. Public POCs for CVE-2021-34715
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-34715
请登录查看更多情报信息。
Vendor Advisories for CVE-2021-34715 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewver-c6WZPXRx vendor-advisory x_refsource_CISCO
Same Patch Batch · Cisco · 2021-08-18 · 7 CVEs total
| CVE-2021-34730 | 9.8 CRITICAL | Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Remote Command Execution an |
| CVE-2021-34745 | 7.8 HIGH | AppDynamics .NET Agent Privilege Escalation Vulnerability |
| CVE-2021-34716 | 6.7 MEDIUM | Cisco Expressway Series and TelePresence Video Communication Server Remote Code Execution |
| CVE-2021-34734 | 6.5 MEDIUM | Cisco Video Surveillance 7000 Series IP Cameras Link Layer Discovery Protocol Double-Free |
| CVE-2021-34749 | 5.8 MEDIUM | Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability |
| CVE-2021-1561 | 5.4 MEDIUM | Cisco Secure Email and Web Manager Spam Quarantine Unauthorized Access Vulnerability |
IV. Related Vulnerabilities
-
CVE-2025-20179
Cisco Expressway Series Cross-Site Scripting Vulnerability -
CVE-2022-20814
Cisco Expressway Series and Cisco TelePresence VCS Improper -
CVE-2022-20853
Cisco Expressway Series and Cisco TelePresence VCS Cross-Sit -
CVE-2024-20492
Cisco Expressway Series Privilege Escalation Vulnerability -
CVE-2024-20497
Cisco Expressway Edge Improper Authorization Vulnerability
Same vendor: Cisco
-
CVE-2026-76504
Cisco Catalyst SD-WAN Manager System Account Authorization B -
CVE-2026-76426
Cisco ISE REST API SQL Injection Vulnerability -
CVE-2026-20121
CIsco FTD Bypass Access List -
CVE-2026-76431
Cisco Identity Services Engine Arbitrary File Deletion Vulne -
CVE-2026-76427
Cisco ISE XML External Entity Injection Vulnerability
Same weakness: CWE-347
-
CVE-2026-71891
BLS12-381 key validation accepts a public key built on a for -
CVE-2026-71887
OpenPGP data signature accepted from a signing subkey withou -
CVE-2026-104437
Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missin -
CVE-2026-104435
Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Witho -
CVE-2026-86326
协议网关固件签名验证绕过漏洞
V. Comments for CVE-2021-34715
No comments yet