What is CVE-2021-1539?

CVE-2021-1539 is a high-severity vulnerability in Cisco Asr 5000, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2021-06-04.

How severe is CVE-2021-1539?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Cisco Asr 5000

CVE-2021-1539

Multiple vulnerabilities in the authorization process of Cisco ASR 5000 Series Software (StarOS) could allow an authenticated, remote attacker to bypass authorization and execute a subset of CLI commands on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Vulnerability class: Broken Access Control

Published 2021-06-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.9th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr5k-au… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1539?: CVE-2021-1539 is a high-severity vulnerability in Cisco Asr 5000, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2021-06-04.
How severe is CVE-2021-1539?: High severity. CVSS v3 base score is 8.1 out of 10.