Auth bypass in Cisco Catalyst_sd-wan_manager

CVE-2026-20127

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 u…

Vulnerability class: Broken Authentication

EPSS: 0.578 (99.0th 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

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 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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-20127?
CVE-2026-20127 is a critical-severity vulnerability in Cisco Catalyst_sd-wan_manager, classified under Improper Authentication. CVSS score: 10.0/10. Published 2026-02-25.
How severe is CVE-2026-20127?
Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2026-20127 known to be exploited?
Yes. CVE-2026-20127 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-25), indicating it is being actively exploited. 10 public proof-of-concept repositories are indexed.