CVE-2021-1546: Cisco SD-WAN Software Information Disclosure Vulnerability

Severity: medium (CVSS 5.5 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: 2021-09-23 · updated 2026-06-17
Weakness: CWE-209

Description

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to access sensitive information. This vulnerability is due to improper protections on file access through the CLI. An attacker could exploit this vulnerability by running a CLI command that targets an arbitrary file on the local system. A successful exploit could allow the attacker to return portions of an arbitrary file, possibly resulting in the disclosure of sensitive information.

Affected products

Cisco Catalyst SD-WAN Manager: from 18.4 before 20.4.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.6.1
Cisco Sd-Wan Vbond Orchestrator: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Sd-Wan Vmanage: from 20.5 before 20.5.2 — fixed in 20.5.2
Cisco Vedge 1000 Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge 100 Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge 100B Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge 100M Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge 100Wm Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge 2000 Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge 5000 Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vedge Cloud Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1
Cisco Vsmart Controller Firmware: from 18.4 before 20.4.2; from 20.5 before 20.5.2; from 20.6 before 20.6.1 — fixed in 20.4.2, 20.5.2, 20.6.1

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.4.2, 20.6.1; Cisco Sd-Wan Vbond Orchestrator 20.4.2, 20.5.2, 20.6.1; Cisco Sd-Wan Vmanage 20.5.2; Cisco Vedge 1000 Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge 100 Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge 100B Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge 100M Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge 100Wm Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge 2000 Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge 5000 Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vedge Cloud Firmware 20.4.2, 20.5.2, 20.6.1; Cisco Vsmart Controller Firmware 20.4.2, 20.5.2, 20.6.1. Check the vendor advisory for mitigations.

References

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