CVE-2021-1431 Cisco IOS XE SD-WAN Software vDaemon Denial of Service Vulnerability

What is CVE-2021-1431?

CVE-2021-1431 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 24 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the vDaemon process of Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to cause a device to reload, resulting a denial of service (DoS) condition. This vulnerability is due to insufficient handling of malformed packets. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Weakness: CWE-20

Which versions are affected by CVE-2021-1431?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2021-1431?

No fix has been published for CVE-2021-1431 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-1431 being exploited?

There is no known exploitation of CVE-2021-1431 in the wild and no public exploit code.

Other vulnerabilities in Cisco Ios Xe

• CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation Exploited Critical 10.0
• CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Exploited Critical 9.8
• CVE-2023-20273 Cisco IOS XE Web UI Command Injection Exploited High 7.2
• CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software Critical 10.0
• CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability Critical 10.0

All Cisco Ios Xe vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9pw7-f4hr-c838.