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,...
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
- 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.
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
20.3.4.0.20
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.2.2.3
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.2.0.4
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.3
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.4.0.24
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.2.2.7
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.4.2.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.4
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.7.1.0.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.8.1
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5.0.8
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5.0.9
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.4.2.2.8
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.3.5.0.7
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.7
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.5
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.10
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.7.2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.9.1EFT2
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.0.11
Affected
Cisco
Cisco Catalyst SD-WAN Manager
20.6.3.1
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
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.
Learn about Pro API access| 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
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 advisoryAll 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 VulnerabilityCisco 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 VulnerabilityCisco 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 VulnerabilityCisco 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
-
KEV confirmed by Google Threat Intelligence
Exploitation attested by an external source
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
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.
- 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 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.