CVE-2026-20182

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, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, 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.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-20182 on 2026-06-28. Shown when MITRE's text differs from the cvelistV5 mirror.

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.

Overview

State: PUBLISHED
Assigner (CNA): cisco
CVSS severity: CRITICAL
CVSS score: 10.0 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Effective score: 10.0 / 10 CRITICAL source: CNA overview
CWE(s): CWE-287
Reserved: 2025-10-08
Published: 2026-05-14 16:08 UTC
Last updated: 2026-05-15 03:56 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/20xxx/CVE-2026-20182.json
Linked Threat: CVE-2026-20182 — Cisco Catalyst SD-WAN: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Vendor / project: Cisco
Product: Catalyst SD-WAN
Date added to KEV: 2026-05-14
Remediation due: 2026-05-17
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.
Ransomware campaign use: Unknown
CISA notes: CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW ; https://nvd.nist.gov/vuln/detail/CVE-2026-20182
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-14 17:16:19 UTC
NVD last modified: 2026-05-15 12:45:53 UTC
NVD CVSS v3.1: 10.0 / 10 CRITICAL source: psirt@cisco.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 6.0 / 10
EPSS score: 0.7732 (probability of exploitation in next 30 days)
EPSS percentile: 99.00% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-30324
Assigner: cisco
Published: May 14, 2026, 4:08:25 PM
Updated: May 29, 2026, 2:14:24 PM
EUVD base score (CVSS 3.1): 10.0 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EUVD-reported EPSS: 77.3200
Vendors: Cisco
Products: Cisco Catalyst SD-WAN Manager (18.4.501_ES)

Cisco Catalyst SD-WAN Manager (18.3.3)

Cisco Catalyst SD-WAN Manager (19.2.1)

Cisco Catalyst SD-WAN Manager (20.1.1)

Cisco Catalyst SD-WAN Manager (20.1.3.1)

Cisco Catalyst SD-WAN Manager (18.3.0)

Cisco Catalyst SD-WAN Manager (19.2.0)

Cisco Catalyst SD-WAN Manager (17.2.5)

Cisco Catalyst SD-WAN Manager (19.2.4.0.9)

Cisco Catalyst SD-WAN Manager (19.2.929)

Cisco Catalyst SD-WAN Manager (18.3.3.1)

Cisco Catalyst SD-WAN Manager (17.2.6)

Cisco Catalyst SD-WAN Manager (17.2.8)

Cisco Catalyst SD-WAN Manager (18.2.0)

Cisco Catalyst SD-WAN Manager (18.4.4)

Cisco Catalyst SD-WAN Manager (18.3.6)

Cisco Catalyst SD-WAN Manager (17.2.9)

Cisco Catalyst SD-WAN Manager (18.4.303)

Cisco Catalyst SD-WAN Manager (19.2.099)

Cisco Catalyst SD-WAN Manager (20.3.2)

Cisco Catalyst SD-WAN Manager (19.2.098)

Cisco Catalyst SD-WAN Manager (18.3.1)

Cisco Catalyst SD-WAN Manager (20.1.12)

Cisco Catalyst SD-WAN Manager (18.4.0.1)

Cisco Catalyst SD-WAN Manager (20.1.2)

Cisco Catalyst SD-WAN Manager (19.2.4)

Cisco Catalyst SD-WAN Manager (18.3.7)

Cisco Catalyst SD-WAN Manager (18.4.0)

Cisco Catalyst SD-WAN Manager (20.1.1.1)

Cisco Catalyst SD-WAN Manager (19.1.0)

Cisco Catalyst SD-WAN Manager (19.2.31)

Cisco Catalyst SD-WAN Manager (19.2.3)

Cisco Catalyst SD-WAN Manager (18.4.5)

Cisco Catalyst SD-WAN Manager (18.3.6.1)
Aliases: GHSA-p83j-mxpw-gqpj

ENISA 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, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, 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.

EUVD references (2)

Affected products (1)

Vendor	Product	Versions	Platforms
Cisco	Cisco Catalyst SD-WAN Manager	`20.1.12` (affected), `19.2.1` (affected), `18.4.4` (affected), `18.4.5` (affected), `20.1.1.1` (affected), `20.1.1` (affected), `19.2.099` (affected), `18.3.6` (affected), `18.3.7` (affected), `19.2.0` (affected), `19.1.0` (affected), `18.4.303` (affected), `19.2.098` (affected), `18.3.6.1` (affected), `18.2.0` (affected), `17.2.8` (affected), `18.3.3.1` (affected), `18.4.0` (affected), `18.3.1` (affected), `17.2.6` (affected), `17.2.9` (affected), `17.2.5` (affected), `18.4.0.1` (affected), `18.3.3` (affected), `18.3.0` (affected), `19.2.3` (affected), `18.4.501_ES` (affected), `20.1.2` (affected), `19.2.929` (affected), `19.2.31` (affected), `20.3.2` (affected), `19.2.4` (affected), `19.2.4.0.9` (affected), `20.1.3.1` (affected)	—

Affected products — CPE 2.3 (4) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.7:*:*:*:*:*:*:*

Vendor references (2)

References embedded in the original CVE record by the assigning CNA.

Web references (22)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://attackerkb.com/topics/CVE-2026-20182 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30324 rapid7:euvd.enisa.europa.eu
http://cwe.mitre.org/data/definitions/287.html rapid7:cwe.mitre.org
https://nvd.nist.gov/vuln/detail/CVE-2026-20182 tenable:nvd.nist.gov
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW tenable:sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk tenable:sec.cloudapps.cisco.com
https://securityaffairs.com/192157/hacking/u-s-cisa-adds-a-flaw-in-cisco-catalyst-sd-wan-to-its-known-exploited-vulnerabilities-catalog.html tenable:securityaffairs.com
https://thehackernews.com/2026/05/cisa-adds-cisco-sd-wan-cve-2026-20182.html tenable:thehackernews.com
https://thehackernews.com/2026/05/cisco-catalyst-sd-wan-controller-auth.html tenable:thehackernews.com
https://thehackernews.com/2026/05/cisco-patches-cvss-100-secure-workload.html tenable:thehackernews.com
https://therecord.media/cisa-orders-all-federal-agencies-to-patch-cisco-sd-wan-bug tenable:therecord.media
https://www.bleepingcomputer.com/news/security/cisco-max-severity-secure-workload-flaw-gives-hackers-site-admin-privileges/ tenable:www.bleepingcomputer.com
https://www.bleepingcomputer.com/news/security/cisco-warns-of-new-critical-sd-wan-flaw-exploited-in-zero-day-attacks/ tenable:www.bleepingcomputer.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182 tenable:www.cisa.gov
https://www.cisa.gov/news-events/alerts/2026/05/14/cisa-adds-one-known-exploited-vulnerability-catalog tenable:www.cisa.gov
https://www.cve.org/CVERecord?id=CVE-2026-20182 tenable:www.cve.org
https://www.darkreading.com/vulnerabilities-threats/maximum-severity-cisco-sd-wan-bug-exploited tenable:www.darkreading.com
https://www.databreachtoday.com/new-cisco-sd-wan-zero-day-grants-admin-access-a-31708 tenable:www.databreachtoday.com
https://www.first.org/epss/ tenable:www.first.org
https://www.securityweek.com/cisco-patches-another-sd-wan-zero-day-the-sixth-exploited-in-2026/ tenable:www.securityweek.com
https://blog.talosintelligence.com/sd-wan-ongoing-exploitation/ tenable:blog.talosintelligence.com
https://cyberscoop.com/cisco-sd-wan-zero-day-exploited/ tenable:cyberscoop.com

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk psirt@cisco.com Not Applicable
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW psirt@cisco.com Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-287`	no local data	2026-05-14 21:51 UTC
cve	`CVE-2026-20182`	no local data	2026-05-14 21:51 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

May 2026: This security advisory provides the details and...

web:github.com

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.

2026-05-14 21:32 UTC
U.S. CISA adds a flaw in Cisco Catalyst SD-WAN to its Known Exploited ...

web:securityaffairs.com

Rapid7 researchers said CVE-2026-20182 resembles the previously exploited CVE - 2026 -20127, another critical authentication bypass in Cisco's SD-WAN vdaemon service over DTLS on UDP port 12346. Although researchers confirmed the new flaw is not a patch bypass, it affects a similar part of the networking stack and leads to the same result.

2026-05-14 21:32 UTC
Cisco Catalyst SD-WAN Controller Auth Bypass Actively Exploited to Gain ...

web:thehackernews.com

CVE-2026-20182 bypasses Cisco SD-WAN auth via DTLS port 12346, enabling admin access after May 2026 exploitation.

2026-05-14 21:32 UTC
A guide to vulnerability remediation vs mitigation | @Bugcrowd

web:www.bugcrowd.com

Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.

2026-05-14 21:32 UTC
Vulnerability Remediation vs. Mitigation: What are the Differences ...

web:www.secure.com

Remediation fully removes a vulnerability by fixing its root cause — through a patch , code fix , or system replacement. Mitigation reduces the risk of exploitation without removing the flaw itself, using controls like network segmentation or access restrictions.

2026-05-14 21:32 UTC
CISA Adds One Known Exploited Vulnerability to Catalog

web:www.cisa.gov

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-20182

2026-05-14 21:32 UTC
CVE-2026-20182 - Authentication bypass in Cisco Catalyst SD-WAN ...

web:www.ionix.io

## Summary CVE-2026-20182 is a critical **authentication bypass** vulnerability affecting Cisco Catalyst SD-WAN Controller (formerly SD‑WAN vSmart) and Cisco Catalyst SD‑WAN Manager (formerly SD‑WAN vManage). An unauthenticated, remote attacker can exploit a flaw in the peering authentication mechanism to bypass authentication and obtain high-privileged administrative access to an ...

2026-05-14 21:32 UTC
CVE-2026-20182: Critical authentication bypass in Cisco ... - Rapid7

web:www.rapid7.com

While researching a critical authentication bypass vulnerability, CVE - 2026 -20127, which was exploited in-the-wild, Rapid7 Labs discovered a new authentication bypass vulnerability affecting Cisco Catalyst SD-WAN Controller (formerly known as vSmart), CVE-2026-20182 .

2026-05-14 21:32 UTC
CISA Required Action

CISA KEV

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. Due date: 2026-05-17 Known ransomware campaign use: Unknown

2026-05-14 21:32 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-20182.json.

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      ],
      "source": {
        "advisory": "cisco-sa-sdwan-rpa2-v69WY2SW",
        "defects": [
          "CSCwt50498"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20182",
    "datePublished": "2026-05-14T16:08:25.566Z",
    "dateReserved": "2025-10-08T11:59:15.393Z",
    "dateUpdated": "2026-05-15T03:56:08.320Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}