What’s Vulnerable › Vulnerabilities

CVE-2021-1145: Cisco StarOS for Cisco ASR 5000 Series Routers Arbitrary File Read Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-13 · updated 2026-06-17
• Weakness: CWE-61

Description

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.

Affected products

• Cisco StarOS: before 21.19.7 — fixed in 21.19.7

How to fix

Upgrade to a fixed version: Cisco StarOS 21.19.7. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-staros-file-read-L3RDvtey
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-staros-file-read-L3RDvtey

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