Denial of service in Cisco SD-WAN vEdge Software

1) Out-of-bounds write

EUVDB-ID: #VU97721

Risk: Low

CVSSv4.0: 2.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-20496

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in the UDP packet validation code. A remote attacker on the local network can trigger an out-of-bounds write and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco SD-WAN vEdge Routers: - - 20.9

Cisco SD-WAN vEdge Cloud Router: - - 20.9

CPE2.3

• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_routers:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_routers:20.5:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_routers:20.6:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_cloud_router:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_cloud_router:20.5:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_sd-wan_vedge_cloud_router:20.6:*:*:*:*:*:*:*

External links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-vedos-KqFfhps3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

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.