CVE-2021-1512: Cisco SD-WAN Software Arbitrary File Corruption Vulnerability

Severity: medium (CVSS 6.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% 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-552

Description

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying file system of an affected system. This vulnerability is due to insufficient validation of the user-supplied input parameters of a specific CLI command. An attacker could exploit this vulnerability by issuing that command with specific parameters. A successful exploit could allow the attacker to overwrite the content in any arbitrary files that reside on the underlying host file system.

Affected products

Cisco Catalyst SD-WAN Manager: from 19.2 before 19.2.3; from 20.3 before 20.3.1; from 20.4 before 20.4.1; from 20.5 before 20.5.1 — fixed in 19.2.3, 20.3.1, 20.4.1, 20.5.1
Cisco Sd-Wan Vbond Orchestrator: all versions
Cisco Sd-Wan Vmanage: before 18.4.6; from 20.1 before 20.1.2 — fixed in 18.4.6, 20.1.2
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 19.2.3, 20.3.1, 20.4.1, 20.5.1; Cisco Sd-Wan Vmanage 18.4.6, 20.1.2. Check the vendor advisory for mitigations.

References

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