CVE-2026-20210 — The Web UI Of Cisco Catalyst SD-WAN Manager, Formerly SD-WAN Vulnerability
CVE-2026-20210 — A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker with read-only permissions to modify configurations and perform unauthorized actions on an affected system. This vulnerability exists because of
What This Means For You
- If your environment is affected by CWE-779, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-20210 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-20210 - Cisco Catalyst SD-WAN Manager Unauthorized Configuration Modification
title: CVE-2026-20210 - Cisco Catalyst SD-WAN Manager Unauthorized Configuration Modification
id: scw-2026-05-14-ai-1
status: experimental
level: critical
description: |
Detects attempts to modify device configurations via the web UI using a POST request to a specific endpoint, indicative of exploiting CVE-2026-20210. This vulnerability allows read-only users to elevate privileges and modify configurations.
author: SCW Feed Engine (AI-generated)
date: 2026-05-14
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-20210/
tags:
- attack.privilege_escalation
- attack.t1078.002
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/webui/data/device/config/template'
cs-method:
- 'POST'
sc-status:
- '200'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-20210 | vulnerability | CVE-2026-20210 |
| CWE-779 | weakness | CWE-779 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 14, 2026 at 20:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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