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CriticalKEV

CVE-2026-20182 — Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

CVE-2026-20182 · Cisco Catalyst SD-WAN Controller · CVSS 10 · KEV

In brief

Severity · CVSS
Critical10CVSS 3.1, Critical
EPSS
92%
CISA KEV
Known exploited, listed since 14 May 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.  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 the 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.

Weakness: CWE-287

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

10 branches with a published fixed release · 33 branches to migrate

Cisco Catalyst SD-WAN Controller

Source: cisco-sa-sdwan-rpa2-v69WY2SWCVE-2026-20182

  1. 26.1
    Affected versions< 26.1.1.1
    First fixed release26.1.1.1
  2. 20.18
    Affected versions< 20.18.2.2
    First fixed release20.18.2.2
  3. 20.16
    Affected versions20.16.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.18.2.2 or later
  4. 20.15
    Affected versions20.15.1, 20.15.2, 20.15.3, 20.15.4
    11 releases listed20.15.1, 20.15.2, 20.15.3, 20.15.4, 20.15.4.1, 20.15.4.2, 20.15.4.3, 20.15.4.5, 20.15.5, 20.15.5.1, 20.15.5.3
    First fixed release20.15.4.420.15.5.2
  5. 20.14
    Affected versions20.14.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.5.2 or later
  6. 20.13
    Affected versions20.13.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.5.2 or later
  7. 20.12
    Affected versions20.12.1, 20.12.2, 20.12.3, 20.12.3.1
    14 releases listed20.12.1, 20.12.2, 20.12.3, 20.12.3.1, 20.12.4, 20.12.4.1, 20.12.5, 20.12.5.1, 20.12.5.2, 20.12.5.3, 20.12.6, 20.12.6.1, 20.12.7, 20.12.7.2
    First fixed release20.12.5.420.12.6.220.12.7.1
  8. 20.11
    Affected versions20.11.1, 20.11.1.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.7.1 or later
  9. 20.10
    Affected versions20.10.1, 20.10.1.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.7.1 or later
  10. 20.9
    Affected versions20.9.1, 20.9.2, 20.9.2.2, 20.9.2.3
    17 releases listed20.9.1, 20.9.2, 20.9.2.2, 20.9.2.3, 20.9.3, 20.9.3.1, 20.9.4, 20.9.5, 20.9.5.1, 20.9.5.3, 20.9.6, 20.9.7, 20.9.7.1, 20.9.8, 20.9.8.2, 20.9.9, 20.9.9.2
    First fixed release20.9.9.1
  11. 20.8
    Affected versions20.8.1
    First fixed releaseMigration to a fixed release required
  12. 20.7
    Affected versions20.7.1, 20.7.2
    First fixed releaseMigration to a fixed release required
  13. 20.6
    Affected versions20.6.1, 20.6.1.2, 20.6.2, 20.6.3
    15 releases listed20.6.1, 20.6.1.2, 20.6.2, 20.6.3, 20.6.3.2, 20.6.3.3, 20.6.4, 20.6.4.1, 20.6.5, 20.6.5.2, 20.6.5.3, 20.6.5.4, 20.6.6, 20.6.7, 20.6.8
    First fixed releaseMigration to a fixed release required
  14. 20.5
    Affected versions20.5.1
    First fixed releaseMigration to a fixed release required
  15. 20.4
    Affected versions20.4.1, 20.4.1.1, 20.4.1.2, 20.4.2
    5 releases listed20.4.1, 20.4.1.1, 20.4.1.2, 20.4.2, 20.4.2.3
    First fixed releaseMigration to a fixed release required
  16. 20.3
    Affected versions20.3.1, 20.3.2, 20.3.3, 20.3.3.2
    13 releases listed20.3.1, 20.3.2, 20.3.3, 20.3.3.2, 20.3.4, 20.3.4.3, 20.3.5, 20.3.5.1, 20.3.6, 20.3.7, 20.3.7.1, 20.3.7.2, 20.3.8
    First fixed releaseMigration to a fixed release required
  17. 20.1
    Affected versions20.1.1, 20.1.2, 20.1.3, 20.1.3.1
    5 releases listed20.1.1, 20.1.2, 20.1.3, 20.1.3.1, 20.1.12
    First fixed releaseMigration to a fixed release required
  18. 19.3
    Affected versions19.3
    First fixed releaseMigration to a fixed release required
  19. 19.2
    Affected versions19.2, 19.2.1, 19.2.2, 19.2.3
    11 releases listed19.2, 19.2.1, 19.2.2, 19.2.3, 19.2.4, 19.2.31, 19.2.32, 19.2.97, 19.2.98, 19.2.99, 19.2.929
    First fixed releaseMigration to a fixed release required
  20. 19.1
    Affected versions19.1
    First fixed releaseMigration to a fixed release required
  21. 19.0
    Affected versions19.0, 19.0.1a
    First fixed releaseMigration to a fixed release required
  22. 18.4
    Affected versions18.4, 18.4.1, 18.4.3, 18.4.4
    7 releases listed18.4, 18.4.1, 18.4.3, 18.4.4, 18.4.5, 18.4.6, 18.4.303
    First fixed releaseMigration to a fixed release required
  23. 18.3
    Affected versions18.3, 18.3.1, 18.3.3, 18.3.4
    8 releases listed18.3, 18.3.1, 18.3.3, 18.3.4, 18.3.5, 18.3.6, 18.3.7, 18.3.8
    First fixed releaseMigration to a fixed release required
  24. 18.2
    Affected versions18.2
    First fixed releaseMigration to a fixed release required
  25. 17.2
    Affected versions17.2.4, 17.2.5, 17.2.6, 17.2.7
    7 releases listed17.2.4, 17.2.5, 17.2.6, 17.2.7, 17.2.8, 17.2.9, 17.2.10
    First fixed releaseMigration to a fixed release required

Cisco Catalyst SD-WAN Manager

Source: cisco-sa-sdwan-rpa2-v69WY2SWCVE-2026-20182

  1. 26.1
    Affected versions< 26.1.1.1
    First fixed release26.1.1.1
  2. 20.18
    Affected versions< 20.18.2.2
    First fixed release20.18.2.2
  3. 20.16
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release requiredTarget: 20.18.2.2 or later
  4. 20.15
    Affected versionsListed as affected, releases not specified
    First fixed release20.15.4.420.15.5.2
  5. 20.14
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.5.2 or later
  6. 20.13
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.5.2 or later
  7. 20.12
    Affected versionsListed as affected, releases not specified
    First fixed release20.12.5.420.12.6.220.12.7.1
  8. 20.11
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.7.1 or later
  9. 20.10
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.7.1 or later
  10. 20.9
    Affected versions< 20.9.9.1
    First fixed release20.9.9.1
  11. 20.3
    Affected versions20.3.2
    First fixed releaseMigration to a fixed release required
  12. 20.1
    Affected versions20.1.1, 20.1.1.1, 20.1.2, 20.1.3.1
    5 releases listed20.1.1, 20.1.1.1, 20.1.2, 20.1.3.1, 20.1.12
    First fixed releaseMigration to a fixed release required
  13. 19.2
    Affected versions19.2, 19.2.1, 19.2.3, 19.2.4
    9 releases listed19.2, 19.2.1, 19.2.3, 19.2.4, 19.2.4.0.9, 19.2.31, 19.2.98, 19.2.99, 19.2.929
    First fixed releaseMigration to a fixed release required
  14. 19.1
    Affected versions19.1
    First fixed releaseMigration to a fixed release required
  15. 18.4
    Affected versions18.4, 18.4.0.1, 18.4.4, 18.4.5
    5 releases listed18.4, 18.4.0.1, 18.4.4, 18.4.5, 18.4.303
    First fixed releaseMigration to a fixed release required
  16. 18.3
    Affected versions18.3, 18.3.1, 18.3.3, 18.3.3.1
    7 releases listed18.3, 18.3.1, 18.3.3, 18.3.3.1, 18.3.6, 18.3.6.1, 18.3.7
    First fixed releaseMigration to a fixed release required
  17. 18.2
    Affected versions18.2
    First fixed releaseMigration to a fixed release required
  18. 17.2
    Affected versions17.2.5, 17.2.6, 17.2.8, 17.2.9
    First fixed releaseMigration to a fixed release required

Remediation

Fix available

Vendor fix

  • Catalyst SD-WAN Controller 26.126.1.1.1
  • Catalyst SD-WAN Controller 20.1820.18.2.2
  • Catalyst SD-WAN Controller 20.1520.15.4.4, 20.15.5.2
  • Catalyst SD-WAN Controller 20.1220.12.5.4, 20.12.6.2, 20.12.7.1
  • Catalyst SD-WAN Controller 20.920.9.9.1
  • Catalyst SD-WAN Manager 26.126.1.1.1
  • Catalyst SD-WAN Manager 20.1820.18.2.2
  • Catalyst SD-WAN Manager 20.1520.15.4.4, 20.15.5.2
  • Catalyst SD-WAN Manager 20.1220.12.5.4, 20.12.6.2, 20.12.7.1
  • Catalyst SD-WAN Manager 20.920.9.9.1

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Branches without a fix of their own: migrate to a fixed release

  • Catalyst SD-WAN Controller 20.16 → 20.18.2.2
  • Catalyst SD-WAN Controller 20.14 → 20.15.5.2
  • Catalyst SD-WAN Controller 20.13 → 20.15.5.2
  • Catalyst SD-WAN Controller 20.11 → 20.12.7.1
  • Catalyst SD-WAN Controller 20.10 → 20.12.7.1
  • Catalyst SD-WAN Controller 20.8
  • Catalyst SD-WAN Controller 20.7
  • Catalyst SD-WAN Controller 20.6
  • Catalyst SD-WAN Controller 20.5
  • Catalyst SD-WAN Controller 20.4
  • Catalyst SD-WAN Controller 20.3
  • Catalyst SD-WAN Controller 20.1
  • Catalyst SD-WAN Controller 19.3
  • Catalyst SD-WAN Controller 19.2
  • Catalyst SD-WAN Controller 19.1
  • Catalyst SD-WAN Controller 19.0
  • Catalyst SD-WAN Controller 18.4
  • Catalyst SD-WAN Controller 18.3
  • Catalyst SD-WAN Controller 18.2
  • Catalyst SD-WAN Controller 17.2
  • Catalyst SD-WAN Manager 20.16 → 20.18.2.2
  • Catalyst SD-WAN Manager 20.14 → 20.15.5.2
  • Catalyst SD-WAN Manager 20.13 → 20.15.5.2
  • Catalyst SD-WAN Manager 20.11 → 20.12.7.1
  • Catalyst SD-WAN Manager 20.10 → 20.12.7.1
  • Catalyst SD-WAN Manager 20.3
  • Catalyst SD-WAN Manager 20.1
  • Catalyst SD-WAN Manager 19.2
  • Catalyst SD-WAN Manager 19.1
  • Catalyst SD-WAN Manager 18.4
  • Catalyst SD-WAN Manager 18.3
  • Catalyst SD-WAN Manager 18.2
  • Catalyst SD-WAN Manager 17.2

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-sdwan-rpa2-v69WY2SW

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-sdwan-rpa2-v69WY2SW

CISA KEV required action

Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined 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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0594

Vendor advisory

SourceCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability</a> was disclosed in February 2026. This new advis…

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 14 May 2026

Federal remediation due date: 17 May 2026

The CISA required action is shown under Remediation.

92% probability of exploitation in the next 30 days (percentile 100%).

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

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0594Published 15 May 2026

Multiple vulnerabilities in Cisco products

Security policy bypassData confidentiality breachPrivilege escalation

Summary

Multiple vulnerabilities have been discovered in Cisco products. They allow an attacker to cause privilege escalation, a data confidentiality breach, and a security policy bypass. Cisco indicates that the vulnerability CVE-2026-20182 is actively exploited.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Added to CISA KEV
  2. Published by the source
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-sdwan-rpa2-v69WY2SW · Cisco Security Advisory cisco-sa-sdwan-rpa-EHchtZk

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained