CVE-2020-27128: Cisco SD-WAN vManage Software Arbitrary File Creation Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 58.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-11-06 · updated 2026-06-17
Weakness: CWE-22

Description

A vulnerability in the application data endpoints of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to write arbitrary files to an affected system. The vulnerability is due to improper validation of requests to APIs. An attacker could exploit this vulnerability by sending malicious requests to an API within the affected application. A successful exploit could allow the attacker to conduct directory traversal attacks and write files to an arbitrary location on the targeted system.

Affected products

Cisco Sd-Wan: before 20.3.1 — fixed in 20.3.1

How to fix

Upgrade to a fixed version: Cisco Sd-Wan 20.3.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-27128 or the next vulnerability affects your stack