Out-of-bounds read in Cisco SD-WAN Software

Published: 2021-07-22
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-1614
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco SD-WAN
Client/Desktop applications / Virtualization software

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Out-of-bounds read

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-1614

CWE-ID: CWE-125 - Out-of-bounds Read

Exploit availability: No


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the Multiprotocol Label Switching (MPLS) packet handling function. A remote attacker can send a specially crafted MPLS packet, trigger out-of-bounds read error and read contents of memory on the system.


Install updates from vendor's website.

Vulnerable software versions

Cisco SD-WAN: 18.4.0, 19.2.0, 20.3.0, 20.4.0, 20.5

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.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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