Cisco Catalyst SD-WAN Manager up to 20.18.2_LI_Images improper authentication

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Cisco Catalyst SD-WAN Manager. It has been rated as critical. Affected by this vulnerability is an unknown functionality. This manipulation causes improper authentication. The identification of this vulnerability is CVE-2026-20127. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Cisco Catalyst SD-WAN Manager and classified as very critical. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric. 

The advisory is shared at sec.cloudapps.cisco.com. This vulnerability is known as CVE-2026-20127 since 10/08/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but an exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/17/2026).

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 299998 (Cisco Catalyst SD-WAN Controller / Manager Authentication Bypass (cisco-sa-sdwan-rpa-EHchtZk)), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 02/25/2026 with a due date of 02/27/2026:

Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL l

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Zero-Day.cz (1078), Tenable (299998) and CERT Bund (WID-SEC-2026-0516). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Cisco Catalyst SD-WAN Manager

Productinfo

Type

• Network Management Software

Vendor

• Cisco

Name

• Catalyst SD-WAN Manager

Version

• 17.2.4
• 17.2.5
• 17.2.6
• 17.2.7
• 17.2.8
• 17.2.9
• 17.2.10
• 18.2.0
• 18.3.0
• 18.3.1
• 18.3.1.1
• 18.3.3
• 18.3.3.1
• 18.3.4
• 18.3.5
• 18.3.6
• 18.3.6.1
• 18.3.7
• 18.3.8
• 18.4.0
• 18.4.0.1
• 18.4.1
• 18.4.3
• 18.4.4
• 18.4.5
• 18.4.6
• 18.4.302
• 18.4.303
• 18.4.501_ES
• 19.0.0
• 19.0.1a
• 19.1.0
• 19.2.0
• 19.2.097
• 19.2.098
• 19.2.099
• 19.2.1
• 19.2.2
• 19.2.3
• 19.2.4
• 19.2.4.0.1
• 19.2.4.0.8
• 19.2.4.0.9
• 19.2.31
• 19.2.32
• 19.2.929
• 19.3.0
• 20.1.1
• 20.1.1.1
• 20.1.2
• 20.1.2_937
• 20.1.3
• 20.1.3.1
• 20.1.12
• 20.3.1
• 20.3.2
• 20.3.2.0.5
• 20.3.2.0.6
• 20.3.2.1
• 20.3.2.1_927
• 20.3.2.1_930
• 20.3.2_925
• 20.3.2_928
• 20.3.2_929
• 20.3.2_937
• 20.3.3
• 20.3.3.0.2
• 20.3.3.0.4
• 20.3.3.0.8
• 20.3.3.0.14
• 20.3.3.0.16
• 20.3.3.0.17
• 20.3.3.0.18
• 20.3.3.1
• 20.3.3.1.1
• 20.3.3.1.2
• 20.3.3.1.5
• 20.3.3.1.7
• 20.3.3.1.10
• 20.3.3.2
• 20.3.4
• 20.3.4.0.1
• 20.3.4.0.5
• 20.3.4.0.6
• 20.3.4.0.9
• 20.3.4.0.11
• 20.3.4.0.19
• 20.3.4.0.20
• 20.3.4.0.24
• 20.3.4.0.25
• 20.3.4.0.26
• 20.3.4.1
• 20.3.4.1.1
• 20.3.4.1.2
• 20.3.4.2
• 20.3.4.2.1
• 20.3.4.2.2
• 20.3.4.3
• 20.3.5
• 20.3.5.0.7
• 20.3.5.0.8
• 20.3.5.0.9
• 20.3.5.1
• 20.3.6
• 20.3.7
• 20.3.7.1
• 20.3.7.2
• 20.3.8
• 20.3.813
• 20.3.814
• 20.4.1
• 20.4.1.0.01
• 20.4.1.0.02
• 20.4.1.0.1
• 20.4.1.1
• 20.4.1.1.5
• 20.4.1.2
• 20.4.2
• 20.4.2.0.1
• 20.4.2.0.2
• 20.4.2.0.4
• 20.4.2.1
• 20.4.2.1.1
• 20.4.2.2
• 20.4.2.2.1
• 20.4.2.2.2
• 20.4.2.2.3
• 20.4.2.2.4
• 20.4.2.2.8
• 20.4.2.3
• 20.5.0.1.1
• 20.5.1
• 20.5.1.0.1
• 20.5.1.0.2
• 20.5.1.1
• 20.5.1.2
• 20.6.0.18.3
• 20.6.0.18.4
• 20.6.1
• 20.6.1.0.1
• 20.6.1.1
• 20.6.1.2
• 20.6.2
• 20.6.2.0.4
• 20.6.2.1
• 20.6.2.2
• 20.6.2.2.2
• 20.6.2.2.3
• 20.6.2.2.4
• 20.6.2.2.7
• 20.6.3
• 20.6.3.0.2
• 20.6.3.0.5
• 20.6.3.0.7
• 20.6.3.0.10
• 20.6.3.0.11
• 20.6.3.0.14
• 20.6.3.0.18
• 20.6.3.0.19
• 20.6.3.0.23
• 20.6.3.0.25
• 20.6.3.0.27
• 20.6.3.0.29
• 20.6.3.0.31
• 20.6.3.0.32
• 20.6.3.0.33
• 20.6.3.0.38
• 20.6.3.0.39
• 20.6.3.0.40
• 20.6.3.0.41
• 20.6.3.0.45
• 20.6.3.0.46
• 20.6.3.0.47
• 20.6.3.0.51
• 20.6.3.1
• 20.6.3.1.1
• 20.6.3.2
• 20.6.3.3
• 20.6.3.4
• 20.6.4
• 20.6.4.0.4
• 20.6.4.0.19
• 20.6.4.0.21
• 20.6.4.1
• 20.6.4.2
• 20.6.5
• 20.6.5.1
• 20.6.5.1.2
• 20.6.5.1.3
• 20.6.5.1.4
• 20.6.5.1.5
• 20.6.5.1.6
• 20.6.5.1.7
• 20.6.5.1.9
• 20.6.5.1.10
• 20.6.5.1.11
• 20.6.5.1.13
• 20.6.5.1.14
• 20.6.5.2
• 20.6.5.2.1
• 20.6.5.2.3
• 20.6.5.2.4
• 20.6.5.2.8
• 20.6.5.3
• 20.6.5.4
• 20.6.5.5
• 20.6.6
• 20.6.6.0.1
• 20.6.7
• 20.6.8
• 20.7.1
• 20.7.1.0.2
• 20.7.1.1
• 20.7.1EFT2
• 20.7.2
• 20.8.1
• 20.9.1
• 20.9.1.1
• 20.9.1EFT2
• 20.9.1_LI_Images
• 20.9.2
• 20.9.2.0.01
• 20.9.2.1
• 20.9.2.2
• 20.9.2.3
• 20.9.2_LI_Images
• 20.9.3
• 20.9.3.0.2
• 20.9.3.0.3
• 20.9.3.0.4
• 20.9.3.0.5
• 20.9.3.0.7
• 20.9.3.0.8
• 20.9.3.0.12
• 20.9.3.0.16
• 20.9.3.0.17
• 20.9.3.0.18
• 20.9.3.0.20
• 20.9.3.0.21
• 20.9.3.0.23
• 20.9.3.0.24
• 20.9.3.0.25
• 20.9.3.0.26
• 20.9.3.0.29
• 20.9.3.1
• 20.9.3.2
• 20.9.3.2_LI_Images
• 20.9.3_LI_ Images
• 20.9.4
• 20.9.4.0.4
• 20.9.4.1
• 20.9.4.1.1
• 20.9.4.1.3
• 20.9.4.1.6
• 20.9.4.1_LI_Images
• 20.9.4_LI_Images
• 20.9.5
• 20.9.5.1
• 20.9.5.1.4
• 20.9.5.1_LI_Images
• 20.9.5.2
• 20.9.5.2.1
• 20.9.5.2.7
• 20.9.5.2.13
• 20.9.5.2.14
• 20.9.5.2.16
• 20.9.5.2.21
• 20.9.5.2_LI_Images
• 20.9.5.3
• 20.9.5.3_LI_Images
• 20.9.5_LI_Images
• 20.9.6
• 20.9.6.0.3
• 20.9.6_LI_Images
• 20.9.7
• 20.9.7.1
• 20.9.7.1_LI _Images
• 20.9.7_LI _Images
• 20.9.8
• 20.9.8_LI_Images
• 20.10.1
• 20.10.1.1
• 20.10.1.2
• 20.10.1_LI_Images
• 20.11.1
• 20.11.1.1
• 20.11.1.2
• 20.11.1_LI_Images
• 20.12.1
• 20.12.1_LI_Images
• 20.12.2
• 20.12.2_LI_Images
• 20.12.3
• 20.12.3.1
• 20.12.3_LI_Images
• 20.12.4
• 20.12.4.0.03
• 20.12.4.0.4
• 20.12.4.0.6
• 20.12.4.1
• 20.12.4.1_LI_Images
• 20.12.4_LI_Images
• 20.12.4_Monthly_ES5
• 20.12.5
• 20.12.5.1
• 20.12.5.1.01
• 20.12.5.1_LI_Images
• 20.12.5.2
• 20.12.5.2_LI_Images
• 20.12.5_LI_Images
• 20.12.6
• 20.12.6_LI_Images
• 20.12.401
• 20.12.501
• 20.13.1
• 20.13.1_LI_Images
• 20.14.1
• 20.14.1_LI_Images
• 20.15.1
• 20.15.1_LI_Images
• 20.15.2
• 20.15.2_LI_Images
• 20.15.3
• 20.15.3.1
• 20.15.4
• 20.15.4.1
• 20.15.4.1_LI_Images
• 20.15.4_LI_Images
• 20.16.1
• 20.16.1_LI_Images
• 20.18.1
• 20.18.1_LI_Images
• 20.18.2
• 20.18.2_LI_Images

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 10.0
CNA Vector (cisco): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Attacked

EPSS Score: 🔒
EPSS Percentile: 🔒

KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 299998
Nessus Name: Cisco Catalyst SD-WAN Controller / Manager Authentication Bypass (cisco-sa-sdwan-rpa-EHchtZk)

Zero-Day.cz: 🔒

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/08/2025 CVE reserved
02/25/2026 +140 days Advisory disclosed
02/25/2026 +0 days VulDB entry created
03/17/2026 +20 days VulDB entry last update

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-sdwan-rpa-EHchtZk
Status: Confirmed

CVE: CVE-2026-20127 (🔒)
GCVE (CVE): GCVE-0-2026-20127
GCVE (VulDB): GCVE-100-347809
CERT Bund: WID-SEC-2026-0516 - Cisco Catalyst SD-WAN Manager und SD-WAN Controller: Mehrere Schwachstellen

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/25/2026 17:50
Updated: 03/17/2026 02:12
Changes: 02/25/2026 17:50 (64), 02/25/2026 20:30 (12), 02/28/2026 19:08 (2), 03/05/2026 13:23 (6), 03/17/2026 02:12 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

Do you need the next level of professionalism?

Upgrade your account now!