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CVE-2021-1528

Cisco SD-WAN Software Privilege Escalation Vulnerability

HIGH
7.8
CVSS Score
Published: June 4, 2021 at 04:45 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
20 products affected across 1 vendorCatalyst Sd WAN ManagerSd WAN Vbond OrchestratorVsmart Controller

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Catalyst Sd WAN Manager· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
Sd WAN Vbond Orchestrator· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
Vedge 100 Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100 (same device)
Vedge 1000 Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-1000 (same device)
Vedge 100B Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100b (same device)
Vedge 100M Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100m (same device)
Vedge 100WM Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100wm (same device)
Vedge 2000 Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-2000 (same device)
Vedge 5000 Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-5000 (same device)
Vedge Cloud Firmware· Cisco
95%
20.4 ≤ v < 20.4.220.5 ≤ v < 20.5.1
Affected range stops below 20.4.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-cloud (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-fuErCWwF

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHcisco
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-250

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