CVE-2026-20128 HIGH

CVE-2026-20128: Cisco Catalyst SD-WAN Manager Information Disclosure Vulnerability

Vendor Cisco
Product Cisco Catalyst SD-WAN Manager
Weakness CWE-257
KEV Status Known Exploited
Published February 25, 2026
Last update April 21, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A vulnerability in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain DCA user privileges on an affected system. This vulnerability is due to the presence of a credential file for the DCA user on an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request and reading the file that contains the DCA password from that affected system. A successful exploit could allow the attacker to access another affected system and gain DCA user privileges. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.

CISA mandated remediation

02CISA Required Action

Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

Key dates

03Disclosure timeline

February 25, 2026 CVE published
April 21, 2026 Record updated

External resources

04References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-20128 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/257.html CISA KEV Reference https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-… CISA KEV Reference https://www.cisa.gov/news-events/directives/supplemental-direc… CISA KEV Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoS… CISA KEV Reference https://nvd.nist.gov/vuln/detail/CVE-2026-20128