Denial of service in Cisco SD-WAN vEdge Routers

1) Buffer overflow

EUVDB-ID: #VU31693

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-3369

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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.

Mitigation

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

• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_5000_series_routers:19.2.0:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_5000_series_routers:19.2.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_5000_series_routers:19.2.097:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_cloud_router:19.2.0:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_cloud_router:19.2.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_cloud_router:19.2.097:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fpdos-hORBfd9f

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.