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CVE-2026-20128: Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-04-20
• EPSS: 7.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-25 · updated 2026-06-17
• Weakness: CWE-257

Description

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.

Affected products

• Cisco Catalyst SD-WAN Manager: before 20.9.8.2; from 20.10 before 20.12.5.3; from 20.13 before 20.15.4.2; from 20.16 before 20.18; 20.12.6 — fixed in 20.12.5.3, 20.15.4.2, 20.18, 20.9.8.2

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.12.5.3, 20.15.4.2, 20.18, 20.9.8.2. Check the vendor advisory for mitigations.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20128

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