Threat Intelligence / CVE / CVE-2026-20129

CVE-2026-20129 — Cisco Catalyst Sd-wan Manager

CVSS v3.1 9.8 (CRITICAL) · EPSS 0.1% (higher than 38.2% of all scored CVEs) · Priority 6.4/10 · Published 2026-02-25

As of 2026-03-04, CVE-2026-20129 is a CRITICAL-severity vulnerability in Cisco Catalyst Sd-wan Manager, CVSS v3.1 9.8, EPSS 0.1% (38.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-20129, most recently “CVE-2026-20127: Critical Cisco Catalyst SD-WAN Authentication Bypass Exploited by UAT-8616 Since 2023 (CVSS 10.0)”.

Last updated: 2026-03-04

What is CVE-2026-20129?

A vulnerability in the API user authentication of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain access to an affected system as a user who has the netadmin role. The vulnerability is due to improper authentication for requests that are sent to the API. An attacker could exploit this vulnerability by sending a crafted request to the API of an affected system. A successful exploit could allow the attacker to execute commands with the privileges of the netadmin role. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.

The record classifies CVE-2026-20129 under weakness class CWE-287. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, 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
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 38.2% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-02-25, last modified 2026-03-04

Is CVE-2026-20129 being exploited?

It currently carries a trending score of 15 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-20129

The record marks a vendor fix as available for CVE-2026-20129. 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-2026-20129

1 tracked threat in the Threadlinqs corpus references CVE-2026-20129, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from threadlinqs-intel 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-2026-20129 are available via the Threadlinqs MCP server (Purple tier). View plans →

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