Is CVE-2021-1257 actively exploited?

No active exploitation of CVE-2021-1257 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-1257 be exploited remotely?

Yes. CVE-2021-1257 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-1257?

CVE-2021-1257 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-1257

CWE-352Published: January 20, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

A vulnerability in the web-based management interface of Cisco DNA Center Software could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack to manipulate an authenticated user into executing malicious actions without their awareness or consent. The vulnerability is due to insufficient CSRF protections for the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a web-based management user to follow a specially crafted link. A successful exploit could allow the attacker to perform arbitrary actions on the device with the privileges of the authenticated user. These actions include modifying the device configuration, disconnecting the user's session, and executing Command Runner commands.

NVD Source

Technical Analysis

CVE-2021-1257 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

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 8.8.