Is CVE-2021-34716 actively exploited?

No active exploitation of CVE-2021-34716 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-34716 be exploited remotely?

Yes. CVE-2021-34716 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-34716?

CVE-2021-34716 has a CVSS score of 7.2 (HIGH).

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HIGH

CVE-2021-34716

CWE-460Published: August 18, 2021· Updated: Jun 17, 2026

7.2

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-34716 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.