CVE-2020-3385: Cisco SD-WAN vEdge Routers Denial of Service Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-16 · updated 2026-06-17
Weakness: CWE-371

Description

A vulnerability in the deep packet inspection (DPI) engine of Cisco SD-WAN vEdge Routers could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected system. The vulnerability is due to insufficient handling of malformed packets. An attacker could exploit this vulnerability by sending crafted packets through an affected device. A successful exploit could allow the attacker to cause the device to reboot, resulting in a DoS condition.

Affected products

Cisco SD-WAN vManage: through 18.3.0; from 18.4.0 before 18.4.5; from 19.2.0 before 19.2.3; from 19.3.0 before 20.1.1 — fixed in 18.4.5, 19.2.3, 20.1.1
Cisco Vedge Cloud Router: all versions

How to fix

Upgrade to a fixed version: Cisco SD-WAN vManage 18.4.5, 19.2.3, 20.1.1. Check the vendor advisory for mitigations.

References

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