CVE-2026-20128

Name: CVE-2026-20128
Creator: NVD / NIST
Published: 2026-02-25T17:25:30.15+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 5.27%

Last modified Jun 17, 2026

CVE-2026-20128 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 5.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

5.27%

91.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Apr 23, 2026.

Weakness Enumeration

CWE-257

Affected Software

Vendor	Product	Versions
Cisco	Catalyst Sd-Wan Manager	< 20.9.8.2
Cisco	Catalyst Sd-Wan Manager	>= 20.10, < 20.12.5.3
Cisco	Catalyst Sd-Wan Manager	>= 20.13, < 20.15.4.2
Cisco	Catalyst Sd-Wan Manager	>= 20.16, < 20.18
Cisco	Catalyst Sd-Wan Manager	20.12.6

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4vVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20128US Government Resource

Timeline

Published: Feb 25, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-20128?

How severe is CVE-2026-20128?

CVE-2026-20128 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 5.27% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2026-20128?

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-2026-20128?

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

Scan your code now

Source: NVD / NIST