CVE-2026-20182CiscoRouters and networkingMay 14, 2026

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Critical 10Actively exploited

Description

Cisco Catalyst SD-WAN Controller & Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.

What to do

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.

Running Cisco devices? Get an email when a new vulnerability comes out. Free, unsubscribe in one click.
Turn on Cisco alerts

Details

Vendor
Cisco
Product
Cisco Catalyst SD-WAN
CVE
CVE-2026-20182
Affected versions
Cisco Catalyst SD-WAN Controller 20.6: 15 versions, from 20.6.1 to 20.6.8
Cisco Catalyst SD-WAN Controller 20.9: 17 versions, from 20.9.1 to 20.9.9.2
Cisco Catalyst SD-WAN Controller 20.3: 13 versions, from 20.3.1 to 20.3.8
Cisco Catalyst SD-WAN Controller 20.7: 20.7.1; 20.7.2
Cisco Catalyst SD-WAN Controller 20.5: 20.5.1
Cisco Catalyst SD-WAN Controller 19.3: 19.3.0
Cisco Catalyst SD-WAN Controller 17.2: 7 versions, from 17.2.4 to 17.2.10
Cisco Catalyst SD-WAN Controller 18.2: 18.2.0
Cisco Catalyst SD-WAN Controller 18.4: 7 versions, from 18.4.0 to 18.4.303
Cisco Catalyst SD-WAN Controller 19.1: 19.1.0
Cisco Catalyst SD-WAN Controller 19.2: 11 versions, from 19.2.0 to 19.2.929
Cisco Catalyst SD-WAN Controller 18.3: 8 versions, from 18.3.0 to 18.3.8
Cisco Catalyst SD-WAN Controller 20.4: 5 versions, from 20.4.1 to 20.4.2.3
Cisco Catalyst SD-WAN Controller 19.0: 19.0.0; 19.0.1a
Cisco Catalyst SD-WAN Controller 20.8: 20.8.1
Cisco Catalyst SD-WAN Controller 20.1: 5 versions, from 20.1.1 to 20.1.12
Cisco Catalyst SD-WAN Controller 20.10: 20.10.1; 20.10.1.1
Cisco Catalyst SD-WAN Controller 20.11: 20.11.1; 20.11.1.1
Cisco Catalyst SD-WAN Controller 20.12: 14 versions, from 20.12.1 to 20.12.7.2
Cisco Catalyst SD-WAN Controller 20.13: 20.13.1
Cisco Catalyst SD-WAN Controller 20.14: 20.14.1
Cisco Catalyst SD-WAN Controller 20.15: 11 versions, from 20.15.1 to 20.15.5.3
Cisco Catalyst SD-WAN Controller 20.16: 20.16.1
Cisco Catalyst SD-WAN Manager 20.1: 5 versions, from 20.1.1 to 20.1.12
Cisco Catalyst SD-WAN Manager 19.2: 9 versions, from 19.2.0 to 19.2.929
Cisco Catalyst SD-WAN Manager 18.4: 6 versions, from 18.4.0 to 18.4.501_ES
Cisco Catalyst SD-WAN Manager 18.3: 7 versions, from 18.3.0 to 18.3.7
Cisco Catalyst SD-WAN Manager 19.1: 19.1.0
Cisco Catalyst SD-WAN Manager 18.2: 18.2.0
Cisco Catalyst SD-WAN Manager 17.2: 4 versions, from 17.2.5 to 17.2.9 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
10
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
May 17, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
May 14, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

More Cisco advisories