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CVE-2021-1528: Cisco SD-WAN Software Privilege Escalation Vulnerability

• Severity: high (CVSS 7.8 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: 2021-06-04 · updated 2026-06-17
• Weakness: CWE-250

Description

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to gain elevated privileges on an affected system. This vulnerability exists because the affected software does not properly restrict access to privileged processes. An attacker could exploit this vulnerability by invoking a privileged process in the affected system. A successful exploit could allow the attacker to perform actions with the privileges of the root user.

Affected products

• Cisco Catalyst SD-WAN Manager: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Sd-Wan Vbond Orchestrator: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 1000 Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 100 Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 100B Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 100M Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 100Wm Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 2000 Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge 5000 Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vedge Cloud Firmware: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1
• Cisco Vsmart Controller: from 20.4 before 20.4.2; from 20.5 before 20.5.1 — fixed in 20.4.2, 20.5.1

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.4.2, 20.5.1; Cisco Sd-Wan Vbond Orchestrator 20.4.2, 20.5.1; Cisco Vedge 1000 Firmware 20.4.2, 20.5.1; Cisco Vedge 100 Firmware 20.4.2, 20.5.1; Cisco Vedge 100B Firmware 20.4.2, 20.5.1; Cisco Vedge 100M Firmware 20.4.2, 20.5.1; Cisco Vedge 100Wm Firmware 20.4.2, 20.5.1; Cisco Vedge 2000 Firmware 20.4.2, 20.5.1; Cisco Vedge 5000 Firmware 20.4.2, 20.5.1; Cisco Vedge Cloud Firmware 20.4.2, 20.5.1; Cisco Vsmart Controller 20.4.2, 20.5.1. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-fuErCWwF
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-fuErCWwF

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