Denial of service in Cisco StarOS

Published: 2021-01-27
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-1353
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco ASR 5000 Series
Hardware solutions / Firmware

Cisco Virtualized Packet Core
Client/Desktop applications / Virtualization software

Cisco StarOS
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Memory leak

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-1353

CWE-ID: CWE-401 - Improper Release of Memory Before Removing Last Reference ('Memory Leak')

Exploit availability: No


The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due to a memory leak that occurs during packet processing. A remote attacker can force the application to leak memory and perform denial of service attack.


Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

Cisco ASR 5000 Series: All versions

Cisco Virtualized Packet Core: All versions

Cisco StarOS: before 21.22.0

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.