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Vulnerability record · CVE-2020-3351 · published 16 July 2020

CVE-2020-3351: Cisco sd-wan firmware uncontrolled resource consumption vulnerability

Cisco · Sd Wan Firmware

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper validation of fields in Cisco SD-WAN peering messages that are encapsulated in UDP packets. An attacker could exploit this vulnerability by sending crafted UDP messages to the targeted system. A successful exploit could allow the attacker to cause services on the device to fail, resulting in a DoS condition that could impact the targeted device and other devices that depend on it.

8.6 CVSS 3.1 High EPSS 1.4% · top 29.1% CWE-399 · CWE-399CWE-400 · Uncontrolled resource consumption
8.6CVSS 3.1 base score, v2 7.8
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper validation of fields in Cisco SD-WAN peering messages that are encapsulated in UDP packets. An attacker could exploit this vulnerability by sending crafted UDP messages to the targeted system. A successful exploit could allow the attacker to cause services on the device to fail, resulting in a DoS condition that could impact the targeted device and other devices that depend on it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-dos-KWOdyHnB Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-dos-KWOdyHnB Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-1300Cisco ios xe sd-wan memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute attacks against an affected device. For …EPSS 2.1%9.8CVE-2021-1301Cisco ios xe sd-wan memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute attacks against an affected device. For …EPSS 2.1%9.8CVE-2018-0349Cisco vbond orchestrator improper input validation vulnerabilityA vulnerability in the Cisco SD-WAN Solution could allow an authenticated, remote attacker to overwrite arbitrary files on the underlying operating s…EPSS 3.0%8.8CVE-2021-1298Cisco sd-wan firmware improper input validation vulnerabilityMultiple vulnerabilities in Cisco SD-WAN products could allow an authenticated attacker to perform command injection attacks against an affected devi…EPSS 2.4%8.8CVE-2021-1299Cisco sd-wan firmware improper input validation vulnerabilityMultiple vulnerabilities in Cisco SD-WAN products could allow an authenticated attacker to perform command injection attacks against an affected devi…EPSS 2.4%8.8CVE-2020-3387Cisco sd-wan firmware improper input validation vulnerabilityA vulnerability in Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to execute code with root privileges on an affected sy…EPSS 13%8.8CVE-2020-3381Cisco sd-wan firmware path traversal vulnerabilityA vulnerability in the web management interface of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct directory t…EPSS 2.6%8.8CVE-2020-3115Cisco sd-wan firmware permissions and access controls vulnerabilityA vulnerability in the CLI of the Cisco SD-WAN Solution vManage software could allow an authenticated, local attacker to elevate privileges to root-l…EPSS 0.33%

Source: NIST National Vulnerability Database (record CVE-2020-3351), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.