CVE-2020-3374

Cisco SD-WAN vManage Software Authorization Bypass Vulnerability

CRITICAL
9.9
CVSS Score
Published: July 31, 2020 at 12:01 AM UTC
Updated: June 17, 2026 at 03:18 AM UTC
2 products affected across 1 vendorSd WANCisco SD-WAN vManage

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Severity
CRITICAL9.9
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the web-based management interface of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to bypass authorization, enabling them to access sensitive information, modify the system configuration, or impact the availability of the affected system. The vulnerability is due to insufficient authorization checking on the affected system. An attacker could exploit this vulnerability by sending crafted HTTP requests to the web-based management interface of an affected system. A successful exploit could allow the attacker to gain privileges beyond what would normally be authorized for their configured user authorization level. The attacker may be able to access sensitive information, modify the system configuration, or impact the availability of the affected system.

Affected

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

v ≤ 18.3.018.4.0 ≤ v < 18.4.519.2.0 ≤ v < 19.2.219.3.0 ≤ v < 20.1.1
Affected range stops below 18.4.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 19.2.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.1.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-285CWE-863

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