Threat Intelligence / CVE / CVE-2026-20182

CVE-2026-20182 — Cisco Catalyst SD-WAN Manager

CISA KEVRansomware

CVSS v3.1 10 (CRITICAL) · EPSS 77.3% (higher than 99.0% of all scored CVEs) · Priority 10/10 · Published 2026-05-14

As of 2026-05-29, CVE-2026-20182 is a CRITICAL-severity vulnerability in Cisco Catalyst SD-WAN Manager, CVSS v3.1 10, EPSS 77.3% (99.0th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-14), with a US federal remediation deadline of 2026-05-17, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2026-20182, most recently “Cisco Catalyst SD-WAN Manager Zero-Day Exploitation Chain (CVE-2026-20245, CVE-2026-20127, CVE-2026-20182)”.

Last updated: 2026-05-29

What is CVE-2026-20182?

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.

The record classifies CVE-2026-20182 under weakness class CWE-287. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 121 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 10 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS (FIRST): 77.3% probability of exploitation in the next 30 days, higher than 99.0% of all scored CVEs
CISA KEV: Listed since 2026-05-14, federal remediation deadline 2026-05-17 — used in known ransomware campaigns
Threadlinqs priority: 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published: 2026-05-14, last modified 2026-05-29

Is CVE-2026-20182 being exploited?

CISA added CVE-2026-20182 to the Known Exploited Vulnerabilities catalog on 2026-05-14, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-05-17 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

Affected products and versions

Cisco: Catalyst SD-WAN Manager

How to fix CVE-2026-20182

Because CVE-2026-20182 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-05-17. No vendor patch reference has been recorded for CVE-2026-20182 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-20182

4 tracked threats in the Threadlinqs corpus reference CVE-2026-20182, either in the campaign’s CVE list or as an indicator on the campaign record.

Cisco Catalyst SD-WAN Manager Zero-Day Exploitation Chain (CVE-2026-20245, CVE-2026-20127, CVE-2026-20182) — CRITICAL · 2026-07-02
Active Exploitation of Cisco Unified Communications Manager WebDialer SSRF (CVE-2026-20230) and Catalyst SD-WAN Manager Root Privilege-Escalation Zero-Day (CVE-2026-20245) — CRITICAL · 2026-07-01
Cisco Catalyst SD-WAN Manager CVE-2026-20245 — Actively Exploited 0-Day: Authenticated File-Upload Command Injection to Root — HIGH · 2026-06-06
Cisco Catalyst SD-WAN CVE-2026-20182 — Critical Authentication Bypass Zero-Day Actively Exploited by UAT-8616 (CVSS 10.0, CISA KEV, ED 26-03) — CRITICAL · 2026-05-14

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-20182 are available via the Threadlinqs MCP server (Purple tier). View plans →

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