CVE-2021-1513: Cisco SD-WAN Software vDaemon Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in the vDaemon process of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to cause a device to reload, resulting in 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.

Affected products

Cisco Catalyst SD-WAN Manager: before 20.3.1; from 20.4 before 20.4.1; from 20.5 before 20.5.1 — fixed in 20.3.1, 20.4.1, 20.5.1
Cisco Sd-Wan Vbond Orchestrator: all versions
Cisco Vedge-100B Firmware: all versions
Cisco Vedge 1000 Firmware: all versions
Cisco Vedge 100 Firmware: all versions
Cisco Vedge 100B Firmware: all versions
Cisco Vedge 100M Firmware: all versions
Cisco Vedge 100Wm Firmware: all versions
Cisco Vedge 2000 Firmware: all versions
Cisco Vedge 5000 Firmware: all versions
Cisco Vedge Cloud Firmware: all versions
Cisco Vsmart Controller Firmware: all versions

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.3.1, 20.4.1, 20.5.1. Check the vendor advisory for mitigations.

References

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