CVE-2020-3375: Cisco SD-WAN Solution Software Buffer Overflow Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-31 · updated 2026-06-17
Weakness: CWE-119

Description

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to gain access to information that they are not authorized to access, make changes to the system that they are not authorized to make, and execute commands on an affected system with privileges of the root user.

Affected products

Cisco IOS XE SD-WAN Software: through 16.9.0; from 16.12.0 through 16.12.4; from 17.2.0 through 17.2.1
Cisco Sd-Wan: through 18.3.0; from 18.4.0 before 18.4.5; from 19.2.0 before 19.2.2; from 19.3.0 before 20.1.1 — fixed in 18.4.5, 19.2.2, 20.1.1

How to fix

Upgrade to a fixed version: Cisco Sd-Wan 18.4.5, 19.2.2, 20.1.1. Check the vendor advisory for mitigations.

References

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