Cisco SD-WAN High-Risk Vulnerabilities (CVE-2020-3374, CVE-2020-3375) Threat Alert

Cisco SD-WAN High-Risk Vulnerabilities (CVE-2020-3374, CVE-2020-3375) Threat Alert

agosto 28, 2020 | Adeline Zhang


Recently, Cisco released an announcement stating that it has repaired two high-risk vulnerabilities in Cisco SD-WAN vManager Software (CVE-2020-3374) and SD-WAN Solution Software (CVE-2020-3375).

Cisco SD-WAN is a secure cloud-scale architecture with openness, programmability, and scalability. Through the Cisco vManage console, you can quickly establish SD-WAN coverage structures to connect data centers, branch offices, campuses, and colocation facilities to improve network speed, security, and efficiency.

Vulnerability Description

1. CVE-2020-3374

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.

Base 9.9 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X

Vulnerability details:

2. CVE-2020-3375

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device.

The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to gain access to the device, change the system’s privileges, and execute commands on the affected system with root privileges.

Base 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X

Vulnerability details:

Affected Products

  • CVE-2020-3374

All products using SD-WAN vManager Software

  • CVE-2020-3375

All products using SD-WAN Solution Software, including:

  • IOS XE SD-WAN Software
    • SD-WAN vBond Orchestrator Software
    • SD-WAN vEdge Cloud Routers
    • SD-WAN vEdge Routers
    • SD-WAN vManage Software
    • SD-WAN vSmart Controller Software

For details about the affected versions, please refer to the security advisories concerning the vulnerabilities.


Cisco has released software updates to fix the preceding vulnerabilities. Affected users are advised to upgrade as soon as possible.


This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.


NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. The company’s Intelligent Hybrid Security strategy utilizes both cloud and on-premises security platforms, built on a foundation of real-time global threat intelligence, to provide multi-layered, unified and dynamic protection against advanced cyber attacks.

NSFOCUS works with Fortune Global 500 companies, including four of the world’s five largest financial institutions, organizations in insurance, retail, healthcare, critical infrastructure industries as well as government agencies. NSFOCUS has technology and channel partners in more than 60 countries, is a member of both the Microsoft Active Protections Program (MAPP), and the Cloud Security Alliance (CSA). A wholly owned subsidiary of NSFOCUS Technologies Group Co., Ltd., the company has operations in the Americas, Europe, the Middle East and Asia Pacific.