Buffer overflow in Cisco SD-WAN and Cisco SD-WAN vEdge Routers - CVE-2021-1241

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Main Vulnerability Database Vulnerabilities #VU50011

Buffer overflow in Cisco SD-WAN and Cisco SD-WAN vEdge Routers - CVE-2021-1241

Published: January 20, 2021 / Updated: January 26, 2021


Vulnerability identifier: #VU50011
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2021-1241
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a boundary error in VPN tunneling features. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.


Affected software

Cisco SD-WAN
Cisco SD-WAN vEdge Routers

How to mitigate CVE-2021-1241

Install updates from vendor's website.

Cisco SD-WAN - addressed in versions 18.4.6, 20.1.2, 20.3.1, 20.3.2, 20.4.1

External References

Related Security Bulletins