CVE-2021-1513

Cisco SD-WAN Software vDaemon Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: May 6, 2021 at 12:50 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
21 products affected across 1 vendorCatalyst Sd WAN ManagerSd WAN Vbond OrchestratorVedge 1000 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the vDaemon process of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to cause a device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient handling of malformed packets. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Affected

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

v < 20.3.120.4 ≤ v < 20.4.120.5 ≤ v < 20.5.1
Affected range stops below 20.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.4.1, 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
All versions
cisco-vedge-100 (same device)
All versions
cisco-vedge-1000 (same device)
All versions
cisco-vedge-100b (same device)
All versions
cisco-vedge-100m (same device)
All versions
cisco-vedge-100wm (same device)
All versions
cisco-vedge-2000 (same device)
All versions
cisco-vedge-5000 (same device)
All versions
cisco-vedge-cloud (same device)

Remediation

No guide yet

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

7.5HIGHcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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