What is the CVSS score of CVE-2026-20129?

CVE-2026-20129 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Catalyst Sd Wan Manager are affected by CVE-2026-20129?

An unauthenticated attacker can remotely compromise Cisco Catalyst SD-WAN Manager and gain administrative access without credentials, potentially enabling full network control and data exfiltration.

How to fix or mitigate CVE-2026-20129?

Within 24 hours: Isolate affected SD-WAN Manager instances from untrusted networks and restrict API access to known administrator IP ranges. Within 7 days: Implement network segmentation to limit lateral movement if compromise occurs, and enable comprehensive API logging and monitoring for suspicious authentication attempts. Within 30 days: Evaluate alternative SD-WAN solutions or request a vendor security timeline, and conduct forensic analysis for indicators of compromise on affected systems.

Catalyst Sd Wan Manager CVE-2026-20129

CRITICAL

Improper Authentication (CWE-287)

2026-02-25 psirt@cisco.com

Cisco Catalyst Sd Wan Manager

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 25, 2026 - 17:25 nvd

CRITICAL 9.8

DescriptionCVE.org

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. 

AnalysisAI

Authentication bypass in Cisco Catalyst SD-WAN Manager API allows unauthenticated remote access to the management platform. Separate vulnerability from the peering auth bypass (CVE-2026-20127).

Technical ContextAI

CWE-287 authentication bypass in the SD-WAN Manager API. Unauthenticated attackers can access management functions.

RemediationAI

Apply Cisco security update. Restrict SD-WAN Manager API access.

More in Catalyst Sd Wan Manager

View all

CVE-2026-20127 CRITICAL Emergency POC

10.0 Feb 25

Cisco Catalyst SD-WAN Controller and Manager contain a critical authentication bypass (CVE-2026-20127, CVSS 10.0) in the

CVE-2022-20775 HIGH This Week POC

7.8 Sep 30

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to gain elevated privil

CVE-2023-20252 CRITICAL Act Now

9.8 Sep 27

A vulnerability in the Security Assertion Markup Language (SAML) APIs of Cisco Catalyst SD-WAN Manager Software could al

CVE-2021-1468 CRITICAL Act Now

9.8 May 06

Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute arb

CVE-2021-1479 CRITICAL Act Now

9.8 Apr 08

Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute arb

CVE-2021-1301 CRITICAL Act Now

9.8 Jan 20

Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute attacks aga

CVE-2021-1300 CRITICAL Act Now

9.8 Jan 20

Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute attacks aga

CVE-2023-20214 CRITICAL Act Now

9.1 Aug 03

A vulnerability in the request authentication validation for the REST API of Cisco SD-WAN vManage software could allow a

CVE-2026-20126 HIGH This Week

8.8 Feb 25

Catalyst Sd-Wan Manager contains a vulnerability that allows attackers to an authenticated, local attacker with low priv

CVE-2022-20696 HIGH This Week

8.8 Sep 08

A vulnerability in the binding configuration of Cisco SD-WAN vManage Software containers could allow an unauthenticated,

CVE-2021-1508 HIGH This Week

8.8 May 06

Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute arb

CVE-2021-1505 HIGH This Week

8.8 May 06

Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute arb

Same weakness CWE-287 – Improper Authentication

View all

CVE-2020-0688 HIGH POC

8.8

CVE-2023-46805 HIGH POC

8.2

CVE-2015-1187 CRITICAL POC

9.8

CVE-2024-7593 CRITICAL POC

9.8

CVE-2017-7921 CRITICAL POC

9.8

CVE-2024-53704 CRITICAL POC

9.8

CVE-2015-7755 CRITICAL POC

9.8

CVE-2013-0625 CRITICAL POC

9.8

CVE-2026-20129 vulnerability details – vuln.today

Back

Catalyst Sd Wan Manager CVE-2026-20129

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Catalyst Sd Wan Manager

Same weakness CWE-287 – Improper Authentication

Share

External POC / Exploit Code