Is CVE-2021-1615 actively exploited?

No active exploitation of CVE-2021-1615 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-1615 be exploited remotely?

Yes. CVE-2021-1615 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-1615?

CVE-2021-1615 has a CVSS score of 8.6 (HIGH).

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HIGH

CVE-2021-1615

CWE-410Published: September 23, 2021· Updated: Jun 17, 2026

8.6

CVSS v3.1

Official Description

A vulnerability in the packet processing functionality of Cisco Embedded Wireless Controller (EWC) Software for Catalyst Access Points (APs) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected AP. This vulnerability is due to insufficient buffer allocation. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to exhaust available resources and cause a DoS condition on an affected AP, as well as a DoS condition for client traffic traversing the AP.

NVD Source

Technical Analysis

CVE-2021-1615 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.