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CVE-2026-20129

Cisco Catalyst SD-WAN Manager authentication bypass

9.8 CRITICALEPSS 0.74%
  1. Published25 Feb 2026

Description

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. 

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Cisco Catalyst SD-WAN Manager≥ 20.11 < 20.12.5.3 · ≥ 20.13 < 20.15.4.2 · ≥ 20.16 < 20.18 · < 20.9.8.2

Remediation

Fixed in
Cisco Catalyst SD-WAN Manager≥ 20.12.5.3

References

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Frequently asked

Is CVE-2026-20129 being actively exploited?

CVE-2026-20129 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.74%.

How severe is CVE-2026-20129?

CVE-2026-20129 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.74% probability of exploitation.

Which products are affected by CVE-2026-20129?

Affected products include Cisco Catalyst SD-WAN Manager.

How do I fix CVE-2026-20129?

Upgrade affected software to a fixed version, for example Cisco Catalyst SD-WAN Manager 20.12.5.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-20129 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.