Is CVE-2026-20128 in the CISA KEV catalog?

Yes. CVE-2026-20128 is on the CISA Known Exploited Vulnerabilities list, added 2026-04-20.

What is the CVSS severity of CVE-2026-20128?

CVE-2026-20128 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-20128?

CVE-2026-20128 has an EPSS score of 5.27% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-20128?

Upgrade catalyst sd-wan manager to 20.18 or later.

CVE & CISA-KEV Catalog

CVE-2026-20128

HIGHCISA KEVEPSS 92th pctl

7.5

CVSS v3

NVD

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.

CWE-257

How to fix

Remediation Available

catalyst sd-wan managerNVD

Affected:>= 20.16, < 20.18Fixed in:20.18CVE-2026-20128derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.27%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-04-23

References

Vendor Advisory1

sec.cloudapps.cisco.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-257 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-23382	Medium	6.5	3.1%	-	Fix
CVE-2019-1010241	Medium	6.5	1.5%	-	-
CVE-2024-32151	Medium	5.9	1.3%	-	-
CVE-2021-27485	High	7.5	1.2%	-	Fix
CVE-2021-0220	Medium	6.8	1.2%	-	-
CVE-2025-57789	Medium	5.4	1.1%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.