TI-2021-00872 Aliases CVE-2021-1145 GHSA-4hw8-23gq-m2qg

Cisco StarOS for Cisco ASR 5000 Series Routers Arbitrary File Read Vulnerability

LOW 31CWE-61Published 2021-01-13 · Updated 2024-11-12

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-61 and the CVSS impact.

Summary

A vulnerability in the Secure FTP (SFTP) of Cisco StarOS for Cisco ASR 5000 Series Routers could allow an authenticated, remote attacker to read arbitrary files on an affected device. To exploit this vulnerability, the attacker would need to have valid credentials on the affected device. The vulnerability is due to insecure handling of symbolic links. An attacker could exploit this vulnerability by sending a crafted SFTP command to an affected device. A successful exploit could allow the attacker to read arbitrary files on the affected device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01288 70th 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 · 4

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:staros::::::::	before 21.19.7	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:o:cisco:staros:*:*:*:*:*:*:*:* Versions before 21.19.7 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

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-1145
2026-10-03 Alias added: GHSA-4hw8-23gq-m2qg

References

Advisory 1

20210113 Cisco StarOS for Cisco ASR 5000 Series Routers Arbitrary File Read Vulnerability

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