TI-2021-01266 Aliases CVE-2021-1540 GHSA-f834-hxf4-wmxm

Cisco ASR 5000 Series Software Authorization Bypass Vulnerabilities

LOW 37CWE-863Published 2021-06-04 · Updated 2024-11-07

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01053 64th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco ASR 5000 Series Software	all versions	—	No fix listed	CNA

Cisco ASR 5000 Series Software VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:staros::::::::	before 21.16.9; 21.17.0 to before 21.17.10; 21.18.0 to before 21.18.16; 21.19.0 to before 21.19.11; 21.19.n to before 21.19.n7; 21.20.0 to before 21.20.8	Vulnerable	Cisco
cpe:2.3:h:cisco:asr_5000:-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:asr_5500:-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:asr_5700:-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:a:cisco:virtualized_packet_core:-:::::::*	not specified by NVD	Vulnerable	Cisco

cpe:2.3:o:cisco:staros:*:*:*:*:*:*:*:* Versions before 21.16.9; 21.17.0 to before 21.17.10; 21.18.0 to before 21.18.16; 21.19.0 to before 21.19.11; 21.19.n to before 21.19.n7; 21.20.0 to before 21.20.8 Vulnerable ·Cisco
cpe:2.3:h:cisco:asr_5000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:asr_5500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:asr_5700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:a:cisco:virtualized_packet_core:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2021-06-04
Cisco ASR 5000 Series Software — 20210602 Cisco ASR 5000 Series Software Authorization Bypass Vulnerabilities
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2021-01265 Cisco ASR 5000 Series Software Authorization Bypass VulnerabilitiesPriority MEDIUM 40
Show all 2 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-1540
2026-10-03 Alias added: GHSA-f834-hxf4-wmxm

References

Advisory 1

20210602 Cisco ASR 5000 Series Software Authorization Bypass Vulnerabilities

TI-2025-23504 Erlang/OTP SSH Vulnerable to Pre-Authentication RCE KEVCVSS 3.1CRITICAL 10.0
TI-2019-01491 Cisco StarOS Denial of Service Vulnerability CVSS 3.0HIGH 8.6
TI-2018-00328 Improper input validation in Cisco StarOS unknown CVSS 3.0HIGH 8.6
TI-2021-01080 Cisco StarOS IPv4 Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2018-00201 Improper input validation in Cisco StarOS CVSS 3.1HIGH 7.5
TI-2021-01105 Cisco StarOS Denial of Service Vulnerability CVSS 3.1HIGH 7.5

See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences