CVE-2021-34716

Cisco Expressway Series and TelePresence Video Communication Server Remote Code Execution Vulnerability

HIGH
7.2
CVSS Score
Published: August 18, 2021 at 07:40 PM UTC
Updated: June 17, 2026 at 03:56 AM UTC
2 products affected across 1 vendorTelepresence Video Communication ServerExpressway

Using Cisco TelePresence Video Communication Server (VCS) Expressway by Cisco?

Get instant alerts when new vulnerabilities affect Cisco TelePresence Video Communication Server (VCS) Expressway - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.2
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to execute arbitrary code on the underlying operating system as the root user. This vulnerability is due to incorrect handling of certain crafted software images that are uploaded to the affected device. An attacker could exploit this vulnerability by authenticating to the system as an administrative user and then uploading specific crafted software images to the affected device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system as the root user.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

x8.6.0 ≤ v < x14.1
Affected range stops below x14.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-460CWE-755

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card