CVE-2026-20128

CVE-2026-20128 is a high-severity vulnerability in Cisco Catalyst Sd-wan Manager with a CVSS 3.x base score of 7.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-04-20). The underlying weakness is classified as CWE-257.

Key facts

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.

Frequently asked questions

What is CVE-2026-20128?
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.
How severe is CVE-2026-20128?
CVE-2026-20128 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-20128 being actively exploited?
Yes. CVE-2026-20128 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-04-20, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-20128?
CVE-2026-20128 primarily affects Cisco Catalyst Sd-wan Manager. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20128?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-20128 have an EU (EUVD) identifier?
Yes. CVE-2026-20128 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8676. It is also flagged as exploited in the EUVD (since 2026-04-20).
When was CVE-2026-20128 published?
CVE-2026-20128 was published on 2026-02-25 and last updated on 2026-06-17.

References

Affected products (2)

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