Auth bypass in Cisco Catalyst_sd-wan_manager
CVE-2026-20182
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 h…
Vulnerability class: Broken Authentication
EPSS: 0.831 (99.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Cisco Catalyst_sd-wan_manager — versions 20.12.7
- Cisco Catalyst Sd-wan Manager — versions 20.1.12, 19.2.1, 18.4.4
- Cisco Sd-wan_vsmart_controller — versions 20.12.7
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- cisco-sa-sdwan-rpa2-v69WY2SW (Vendor Advisory)
- Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability</a> was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The <a href="#IOC">Indicators of Compromise (Not Applicable)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2026-20182?
- CVE-2026-20182 is a critical-severity vulnerability in Cisco Catalyst_sd-wan_manager, classified under Improper Authentication. CVSS score: 10.0/10. Published 2026-05-14.
- How severe is CVE-2026-20182?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-20182 known to be exploited?
- Yes. CVE-2026-20182 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-14), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.