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CVE-2026-20127

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

  • Critical 10.0
  • Exploited: added to CISA KEV 25 Feb 2026

Description

A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, 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. 

Key facts

Published
25 Feb 2026
Last changed
16 Jun 2026
Assigned by
cisco
KEV added
25 Feb 2026
KEV fix due
27 Feb 2026
EPSS
87.62% likely to be exploited in the next 30 days, higher than 99.763% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 10.0CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

What to do

  • 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 listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

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

Timeline

  1. 25 Feb 2026 Added to the CISA KEV catalogue
  2. 25 Feb 2026 Published

Weakness

Related coverage

References