KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-20127

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Cisco / Cisco Catalyst SD-WAN Manager · 20.1.12

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Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
88.2%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-20127 is an unauthenticated Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability. A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart,...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Cisco / Cisco Catalyst SD-WAN Manager 20.1.12.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

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. 

Vendor Product Affected Status
Cisco Cisco Catalyst SD-WAN Manager 20.6.2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.7.1EFT2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.0.9 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.0.11 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.4.2.0.4 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.3.0.18 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.7.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.6.2.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.5.1.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.4.2.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.4.2.1.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.1.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.813 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.0.19 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.4.2.2.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.5.1.2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.814 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.4.2.2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.6.2.2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.2.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.7.1.1 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.3.4.1.2 Affected
Cisco Cisco Catalyst SD-WAN Manager 20.6.2.2.2 Affected
Published
25 Feb 2026
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa edge

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-20127
  • cisco-sa-sdwan-rpa-EHchtZk sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2026-06-01 11:10 UTC
CISA 2026-06-02 14:03 UTC
Google Threat Intelligence 2026-06-24 14:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

88.2%

Weaknesses

Improper Authentication CWE-287

Recent mention · Google Threat Intelligence

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan Introduction  In early 2026, Mandiant identified a threat actor targeting SD-WAN...

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan Introduction  In early 2026, Mandiant identified a threat actor targeting SD-WAN infrastructure at a service provider. After gaining initial access, the threat actor exploited a zero-day vulnerability...

Read full advisory

All Mentions

Recent mention · Google Threat Intelligence

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan Introduction  In early 2026, Mandiant identified a threat actor targeting SD-WAN...

Google Threat Intelligence · 24 Jun 2026

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan Introduction  In early 2026, Mandiant identified a threat actor targeting SD-WAN infrastructure at a service provider. After gaining initial access, the threat actor exploited a zero-day vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN to escalate privileges from a compromised administrative account to root-level access. The vulnerability stems from the device’s file upload feature lacking the ability to properly filter malicious data. Throughout the intrusion, to maintain operational security and avoid detection, the...

Recent mention · Google Threat Intelligence

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan, Lukasz Lamparski Introduction  In early 2026, Mandiant identified a threat actor...

Google Threat Intelligence · 24 Jun 2026

Written by: Chester Sng, Pete Boonyakarn, Logeswaran Nadarajan, Lukasz Lamparski Introduction  In early 2026, Mandiant identified a threat actor targeting SD-WAN infrastructure at a service provider. After gaining initial access, the threat actor exploited a zero-day vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN to escalate privileges from a compromised administrative account to root-level access. The vulnerability stems from the device’s file upload feature lacking the ability to properly filter malicious data. Throughout the intrusion, to maintain operational security and avoid...

Recent mention · Cisco Security Advisory

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Cisco Security Advisory · 16 Jun 2026

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...

Recent mention · Cisco Security Advisory

Cisco Catalyst SD-WAN Controller, Catalyst SD-WAN Manager, and Catalyst SD-WAN Validator Authenticated Privilege Escalation Vulnerability

Cisco Security Advisory · 09 Jun 2026

A vulnerability in the CLI of 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 authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by uploading a crafted file to the affected system. A successful exploit could allow the attacker to perform command injection...

Recent mention · Cisco Security Advisory

Cisco Catalyst SD-WAN Manager Authenticated Privilege Escalation Vulnerability

Cisco Security Advisory · 04 Jun 2026

A vulnerability in the CLI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by uploading a crafted file to the affected system. A successful exploit could allow the attacker to perform command injection attacks on an affected system and elevate their privileges as the root user.  To exploit this vulnerability, the attacker...

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by Google Threat Intelligence

    Exploitation attested by an external source

  2. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-20127

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-20127",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.88243,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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