Is CVE-2021-1306 being actively exploited?

CVE-2021-1306 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2021-1306?

CVE-2021-1306 has a CVSS 3.1 base score of 4.4 (MEDIUM).

CVE-2021-1306

MEDIUM · CVSS 4.4EPSS 0.2%EU EUVD

A vulnerability in the restricted shell of Cisco Evolved Programmable Network (EPN) Manager, Cisco Identity Services Engine (ISE), and Cisco Prime Infrastructure could allow an authenticated, local attacker to identify directories and write arbitrary files to the file system. This vulnerability is due to improper validation of parameters that are sent to a CLI command within the restricted shell. An attacker could exploit this vulnerability by logging in to the device and issuing certain CLI commands. A successful exploit could allow the attacker to identify file directories on the affected device and write arbitrary files to the file system on the affected device. To exploit this vulnerability, the attacker must be an authenticated shell user.

Key facts

CVSS score: 4.4 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-73
EPSS score: 0.2% (11th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2021-6773)
Published: May 22, 2021
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2021-6773 in the EU Vulnerability Database. Last updated in EUVD on November 8, 2024.

View on the EU Vulnerability Database

Affected products

cisco / evolved programmable network manager
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / identity services engine
cisco / prime infrastructure
cisco / prime infrastructure

Certified products that may be affected

3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Prime Infrastructure 3.2 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10860-2018 - archived
Cisco ISE v2.0 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-10795-2017 - archived
Cisco Identity Services Engine (ISE) v1.2 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10521-2014 - archived

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ade-xcvAQEOZ(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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