CVE-2026-20128
HIGHCISA KEVEPSS 93th pctlDescription
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 to fix
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
Impact
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Exploit Intelligence
High risk: more likely to be exploited than 93% of all known CVEs.
Remediation due: 2026-04-23
References
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 |
Common questions
How do I fix CVE-2026-20128?
Upgrade catalyst sd-wan manager to 20.18 or later.
Is CVE-2026-20128 being actively exploited?
Yes. CVE-2026-20128 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-04-23. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2026-20128?
CVE-2026-20128 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-20128 affect?
Published advisories record a fix for catalyst sd-wan manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-20128
Markdown
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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.