Denial of service in Cisco SD-WAN vEdge Routers

Published: 2020-07-20
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-3369
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco SD-WAN vEdge 5000 Series Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco SD-WAN vEdge Cloud Router
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU31693

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3369

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper processing of FTP traffic. A remote attacker can send a specially crafted FTP packets, trigger memory corruption and cause a denial of service condition on the target system.


Install update from vendor's website.

Vulnerable software versions

Cisco SD-WAN vEdge 5000 Series Routers: 19.2.0 - 20.1.0

Cisco SD-WAN vEdge Cloud Router: 19.2.0 - 20.1.0

CPE2.3 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 send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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