CVE-2020-3591

Name: CVE-2020-3591
Creator: NVD / NIST
Published: 2020-11-06T19:15:15.25+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2020-3591 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. A vulnerability in the web-based management interface of the Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. EPSS estimates a 0.71% chance of exploitation in the next 30 days.

Description

A vulnerability in the web-based management interface of the Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.71%

49.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Catalyst Sd-Wan Manager	20.3.1
Cisco	Sd-Wan Vmanage	<= 20.1.12

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vmanxsshi-9KHEqRpMPatch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vmanxsshi-9KHEqRpMPatch, Vendor Advisory

Timeline

Published: Nov 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3591?

How severe is CVE-2020-3591?

CVE-2020-3591 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3591?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3591?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST