Threat Intelligence / CVE / CVE-2026-20128

CVE-2026-20128 — Cisco Catalyst Sd-wan Manager

CVSS v3.1 7.5 (HIGH) · EPSS 0.0% (higher than 1.4% of all scored CVEs) · Priority 3.8/10 · Published 2026-02-25

As of 2026-03-20, CVE-2026-20128 is a HIGH-severity vulnerability in Cisco Catalyst Sd-wan Manager, CVSS v3.1 7.5, EPSS 0.0% (1.4th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-20128, most recently “CVE-2026-20127: Critical Cisco Catalyst SD-WAN Authentication Bypass Exploited by UAT-8616 Since 2023 (CVSS 10.0)”.

Last updated: 2026-03-20

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.

The record classifies CVE-2026-20128 under weakness class CWE-257. Its CVSS v3 base vector states that the flaw requires local access to the host, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 199 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS (FIRST)
0.0% probability of exploitation in the next 30 days, higher than 1.4% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
3.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-02-25, last modified 2026-03-20

Is CVE-2026-20128 being exploited?

It currently carries a trending score of 5 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-20128

The record marks a vendor fix as available for CVE-2026-20128. Patch reference: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-vmanage-2026. Vendor advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-20128

2 tracked threats in the Threadlinqs corpus reference CVE-2026-20128, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from research and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-20128 are available via the Threadlinqs MCP server (Purple tier). View plans →

← all vulnerabilities · Markdown version · Threadlinqs Intelligence