CRITICAL KEV
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Published May 14, 2026 ·Due May 17, 2026
10.0
CRITICALCVSS 3.1
EPSS 91.52%
Description
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 handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks. 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 the 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.
Affected products
-
- Version 17.2.10StatusaffectedConstraints-
- Version 17.2.4StatusaffectedConstraints-
- Version 17.2.5StatusaffectedConstraints-
- Version 17.2.6StatusaffectedConstraints-
- Version 17.2.7StatusaffectedConstraints-
- Version 17.2.8StatusaffectedConstraints-
- Version 17.2.9StatusaffectedConstraints-
- Version 18.2.0StatusaffectedConstraints-
- Version 18.3.0StatusaffectedConstraints-
- Version 18.3.1StatusaffectedConstraints-
- Version 18.3.3StatusaffectedConstraints-
- Version 18.3.4StatusaffectedConstraints-
- Version 18.3.5StatusaffectedConstraints-
- Version 18.3.6StatusaffectedConstraints-
- Version 18.3.7StatusaffectedConstraints-
- Version 18.3.8StatusaffectedConstraints-
- Version 18.4.0StatusaffectedConstraints-
- Version 18.4.1StatusaffectedConstraints-
- Version 18.4.3StatusaffectedConstraints-
- Version 18.4.303StatusaffectedConstraints-
- Version 18.4.4StatusaffectedConstraints-
- Version 18.4.5StatusaffectedConstraints-
- Version 18.4.6StatusaffectedConstraints-
- Version 19.0.0StatusaffectedConstraints-
- Version 19.0.1aStatusaffectedConstraints-
- Version 19.1.0StatusaffectedConstraints-
- Version 19.2.0StatusaffectedConstraints-
- Version 19.2.097StatusaffectedConstraints-
- Version 19.2.098StatusaffectedConstraints-
- Version 19.2.099StatusaffectedConstraints-
- Version 19.2.1StatusaffectedConstraints-
- Version 19.2.2StatusaffectedConstraints-
- Version 19.2.3StatusaffectedConstraints-
- Version 19.2.31StatusaffectedConstraints-
- Version 19.2.32StatusaffectedConstraints-
- Version 19.2.4StatusaffectedConstraints-
- Version 19.2.929StatusaffectedConstraints-
- Version 19.3.0StatusaffectedConstraints-
- Version 20.1.1StatusaffectedConstraints-
- Version 20.1.12StatusaffectedConstraints-
- Version 20.1.2StatusaffectedConstraints-
- Version 20.1.3StatusaffectedConstraints-
- Version 20.1.3.1StatusaffectedConstraints-
- Version 20.10.1StatusaffectedConstraints-
- Version 20.10.1.1StatusaffectedConstraints-
- Version 20.11.1StatusaffectedConstraints-
- Version 20.11.1.1StatusaffectedConstraints-
- Version 20.12.1StatusaffectedConstraints-
- Version 20.12.2StatusaffectedConstraints-
- Version 20.12.3StatusaffectedConstraints-
- Version 20.12.3.1StatusaffectedConstraints-
- Version 20.12.4StatusaffectedConstraints-
- Version 20.12.4.1StatusaffectedConstraints-
- Version 20.12.5StatusaffectedConstraints-
- Version 20.12.5.1StatusaffectedConstraints-
- Version 20.12.5.2StatusaffectedConstraints-
- Version 20.12.5.3StatusaffectedConstraints-
- Version 20.12.6StatusaffectedConstraints-
- Version 20.12.6.1StatusaffectedConstraints-
- Version 20.12.7StatusaffectedConstraints-
- Version 20.12.7.2StatusaffectedConstraints-
- Version 20.13.1StatusaffectedConstraints-
- Version 20.14.1StatusaffectedConstraints-
- Version 20.15.1StatusaffectedConstraints-
- Version 20.15.2StatusaffectedConstraints-
- Version 20.15.3StatusaffectedConstraints-
- Version 20.15.4StatusaffectedConstraints-
- Version 20.15.4.1StatusaffectedConstraints-
- Version 20.15.4.2StatusaffectedConstraints-
- Version 20.15.4.3StatusaffectedConstraints-
- Version 20.15.4.5StatusaffectedConstraints-
- Version 20.15.5StatusaffectedConstraints-
- Version 20.15.5.1StatusaffectedConstraints-
- Version 20.15.5.3StatusaffectedConstraints-
- Version 20.16.1StatusaffectedConstraints-
- Version 20.3.1StatusaffectedConstraints-
- Version 20.3.2StatusaffectedConstraints-
- Version 20.3.3StatusaffectedConstraints-
- Version 20.3.3.2StatusaffectedConstraints-
- Version 20.3.4StatusaffectedConstraints-
- Version 20.3.4.3StatusaffectedConstraints-
- Version 20.3.5StatusaffectedConstraints-
- Version 20.3.5.1StatusaffectedConstraints-
- Version 20.3.6StatusaffectedConstraints-
- Version 20.3.7StatusaffectedConstraints-
- Version 20.3.7.1StatusaffectedConstraints-
- Version 20.3.7.2StatusaffectedConstraints-
- Version 20.3.8StatusaffectedConstraints-
- Version 20.4.1StatusaffectedConstraints-
- Version 20.4.1.1StatusaffectedConstraints-
- Version 20.4.1.2StatusaffectedConstraints-
- Version 20.4.2StatusaffectedConstraints-
- Version 20.4.2.3StatusaffectedConstraints-
- Version 20.5.1StatusaffectedConstraints-
- Version 20.6.1StatusaffectedConstraints-
- Version 20.6.1.2StatusaffectedConstraints-
- Version 20.6.2StatusaffectedConstraints-
- Version 20.6.3StatusaffectedConstraints-
- Version 20.6.3.2StatusaffectedConstraints-
- Version 20.6.3.3StatusaffectedConstraints-
- Version 20.6.4StatusaffectedConstraints-
- Version 20.6.4.1StatusaffectedConstraints-
- Version 20.6.5StatusaffectedConstraints-
- Version 20.6.5.2StatusaffectedConstraints-
- Version 20.6.5.3StatusaffectedConstraints-
- Version 20.6.5.4StatusaffectedConstraints-
- Version 20.6.6StatusaffectedConstraints-
- Version 20.6.7StatusaffectedConstraints-
- Version 20.6.8StatusaffectedConstraints-
- Version 20.7.1StatusaffectedConstraints-
- Version 20.7.2StatusaffectedConstraints-
- Version 20.8.1StatusaffectedConstraints-
- Version 20.9.1StatusaffectedConstraints-
- Version 20.9.2StatusaffectedConstraints-
- Version 20.9.2.2StatusaffectedConstraints-
- Version 20.9.2.3StatusaffectedConstraints-
- Version 20.9.3StatusaffectedConstraints-
- Version 20.9.3.1StatusaffectedConstraints-
- Version 20.9.4StatusaffectedConstraints-
- Version 20.9.5StatusaffectedConstraints-
- Version 20.9.5.1StatusaffectedConstraints-
- Version 20.9.5.3StatusaffectedConstraints-
- Version 20.9.6StatusaffectedConstraints-
- Version 20.9.7StatusaffectedConstraints-
- Version 20.9.7.1StatusaffectedConstraints-
- Version 20.9.8StatusaffectedConstraints-
- Version 20.9.8.2StatusaffectedConstraints-
- Version 20.9.9StatusaffectedConstraints-
- Version 20.9.9.2StatusaffectedConstraints-
- Version
-
- Version 17.2.5StatusaffectedConstraints-
- Version 17.2.6StatusaffectedConstraints-
- Version 17.2.8StatusaffectedConstraints-
- Version 17.2.9StatusaffectedConstraints-
- Version 18.2.0StatusaffectedConstraints-
- Version 18.3.0StatusaffectedConstraints-
- Version 18.3.1StatusaffectedConstraints-
- Version 18.3.3StatusaffectedConstraints-
- Version 18.3.3.1StatusaffectedConstraints-
- Version 18.3.6StatusaffectedConstraints-
- Version 18.3.6.1StatusaffectedConstraints-
- Version 18.3.7StatusaffectedConstraints-
- Version 18.4.0StatusaffectedConstraints-
- Version 18.4.0.1StatusaffectedConstraints-
- Version 18.4.303StatusaffectedConstraints-
- Version 18.4.4StatusaffectedConstraints-
- Version 18.4.5StatusaffectedConstraints-
- Version 18.4.501_ESStatusaffectedConstraints-
- Version 19.1.0StatusaffectedConstraints-
- Version 19.2.0StatusaffectedConstraints-
- Version 19.2.098StatusaffectedConstraints-
- Version 19.2.099StatusaffectedConstraints-
- Version 19.2.1StatusaffectedConstraints-
- Version 19.2.3StatusaffectedConstraints-
- Version 19.2.31StatusaffectedConstraints-
- Version 19.2.4StatusaffectedConstraints-
- Version 19.2.4.0.9StatusaffectedConstraints-
- Version 19.2.929StatusaffectedConstraints-
- Version 20.1.1StatusaffectedConstraints-
- Version 20.1.1.1StatusaffectedConstraints-
- Version 20.1.12StatusaffectedConstraints-
- Version 20.1.2StatusaffectedConstraints-
- Version 20.1.3.1StatusaffectedConstraints-
- Version 20.3.2StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Cisco | Cisco Catalyst SD-WAN Controller | n/a |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cisco | Cisco Catalyst SD-WAN Manager | n/a |
|
OR
- < 20.9.9.1
- ≥ 20.10 · < 20.12.5.4
- ≥ 20.12.6 · < 20.12.6.2
- ≥ 20.13 · < 20.15.4.4
- ≥ 20.15.5 · < 20.15.5.2
- ≥ 20.16 · < 20.18.2.2
- ≥ 26.1 · < 26.1.1.1
- 20.12.7
- < 20.9.9.1
- ≥ 20.10 · < 20.12.5.4
- ≥ 20.12.6 · < 20.12.6.2
- ≥ 20.13 · < 20.15.4.4
- ≥ 20.15.5 · < 20.15.5.2
- ≥ 20.16 · < 20.18.2.2
- ≥ 26.1 · < 26.1.1.1
- 20.12.7
- < 20.9.9.1
- ≥ 20.10 · < 20.12.5.4
- ≥ 20.12.6 · < 20.12.6.2
- ≥ 20.13 · < 20.15.4.4
- ≥ 20.15.5 · < 20.15.5.2
- ≥ 20.16 · < 20.18.2.2
- ≥ 26.1 · < 26.1.1.1
- 20.12.7
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
10.0 CRITICAL CVE.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
Listed in CISA KEV KEV
Date Added
May 14, 2026
Patch Due
May 17, 2026
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.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed May 14, 2026 · SSVC 2.0.3
91.52% 0.91522
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.91522
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 91.52% (0.91522) | 99.81th | v5 (v2026.06.15) |
| Aug 11, 2026 | 91.52% (0.91522) | 99.80th | v5 (v2026.06.15) |
| Jul 24, 2026 | 90.27% (0.90272) | 99.78th | v5 (v2026.06.15) |
| Jun 23, 2026 | 87.69% (0.87693) | 99.73th | v5 (v2026.06.15) |
| Jun 22, 2026 | 76.29% (0.76286) | 99.47th | v5 (v2026.06.15) |
| Jun 15, 2026 | 77.90% (0.77902) | 99.51th | v5 (v2026.06.15) |
| Jun 4, 2026 | 83.13% (0.83125) | 99.28th | v4 (v2025.03.14) |
| Jun 1, 2026 | 80.54% (0.80539) | 99.16th | v4 (v2025.03.14) |
| May 22, 2026 | 77.32% (0.77324) | 99.00th | v4 (v2025.03.14) |
| May 21, 2026 | 69.19% (0.69191) | 98.66th | v4 (v2025.03.14) |
| May 20, 2026 | 23.69% (0.23694) | 96.07th | v4 (v2025.03.14) |
| May 18, 2026 | 25.95% (0.25945) | 96.33th | v4 (v2025.03.14) |
| May 17, 2026 | 31.70% (0.31703) | 96.85th | v4 (v2025.03.14) |
| May 16, 2026 | 37.95% (0.37954) | 97.26th | v4 (v2025.03.14) |
| May 15, 2026 | 1.56% (0.01561) | 81.67th | v4 (v2025.03.14) |
Weaknesses (1)
References (3)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk Not Applicable
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182 government-resourceUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk | Not Applicable | |
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW | Vendor Advisory | |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182 | government-resourceUS Government Resource |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published May 14, 2026
Updated Jun 16, 2026
Reserved Oct 8, 2025
Link CVE-2026-20182
CISA Vulnrichment
Updated May 14, 2026