Exploit for Improper Encoding or Escaping of Output in Cisco Catalyst_Sd-Wan_Manager CVE-2026-20245

## https://sploitus.com/exploit?id=1D21D5F1-F7EE-589C-8C6B-82A7EA43E526
# 🚨 CVE-2026-20245 - Cisco Catalyst SD-WAN Manager Privilege Escalation







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**Authenticated Privilege Escalation via Crafted File Upload**

*A vulnerability affecting Cisco Catalyst SD-WAN Manager that allows authenticated attackers with administrative privileges to execute arbitrary commands as root.*



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# 📖 Overview

CVE-2026-20245 is a high-severity privilege escalation vulnerability affecting Cisco Catalyst SD-WAN Manager. The vulnerability arises from insufficient validation of uploaded files processed by the management platform.

An authenticated attacker possessing **netadmin** privileges can upload a specially crafted file, resulting in arbitrary command execution with **root** privileges on the underlying operating system.

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# 🎯 Vulnerability Information

| Field | Value |
|---------|---------|
| CVE ID | CVE-2026-20245 |
| Severity | High |
| CVSS Score | 7.8 |
| Attack Vector | Authenticated |
| Complexity | Low |
| Privileges Required | Netadmin |
| User Interaction | None |
| Impact | Root Command Execution |
| Vendor | Cisco |
| Product | Catalyst SD-WAN Manager |

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# ⚡ Affected Products

The vulnerability affects Cisco SD-WAN deployments including:

- Cisco Catalyst SD-WAN Manager (vManage)
- Cisco Catalyst SD-WAN Controller (vSmart)
- Cisco Catalyst SD-WAN Validator (vBond)

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# 🔥 Attack Scenario

```text
┌─────────────────────┐
│ Authenticated User  │
│   (netadmin role)   │
└──────────┬──────────┘
           │
           ▼
 Upload Crafted File
           │
           ▼
 Input Validation Bypass
           │
           ▼
 Command Injection
           │
           ▼
 Root Privilege Execution
           │
           ▼
 Complete Device Control
```

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# 🛠 Technical Details

## Root Cause

The CLI subsystem fails to properly validate user-controlled input contained within uploaded files.

Improper sanitization allows malicious content to be interpreted by privileged processes running on the management platform.

## Vulnerability Type

- Command Injection
- Privilege Escalation
- Improper Input Validation
- Arbitrary Command Execution

---

# 💥 Impact

Successful exploitation may allow attackers to:

- Gain root-level access
- Execute arbitrary operating system commands
- Modify SD-WAN configurations
- Push malicious policies to edge devices
- Establish persistence
- Access sensitive network infrastructure
- Disrupt enterprise WAN operations

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# 🔍 Indicators of Compromise

## Suspicious File Uploads

```bash
grep -Ri "upload" /var/log/*
```

## Unusual Administrative Activity

```bash
grep -Ri "netadmin" /var/log/*
```

## Privileged Command Execution

```bash
grep -Ri "sudo" /var/log/*
```

## Audit Recent Configuration Changes

```bash
show audit log
```

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# 🧪 Detection Opportunities

### Review

- Unexpected file uploads
- New administrator accounts
- Unauthorized policy deployments
- Unusual root process activity
- Configuration changes outside maintenance windows

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# 🛡 Mitigation

## Recommended Actions

### 1. Upgrade Immediately

Install Cisco security updates that address CVE-2026-20245.

### 2. Restrict Administrative Access

- Enforce least privilege
- Limit netadmin accounts
- Review role assignments

### 3. Enable Centralized Logging

Forward logs to:

- Splunk
- ELK
- QRadar
- Microsoft Sentinel

### 4. Monitor File Upload Activity

Create alerts for:

- Unusual uploads
- Administrative configuration imports
- CLI subsystem errors

### 5. Audit SD-WAN Infrastructure

Review:

- Running configurations
- Device inventories
- Administrative users
- Recently pushed policies

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# 📊 Risk Assessment

| Category | Rating |
|-----------|-----------|
| Confidentiality | 🔴 High |
| Integrity | 🔴 High |
| Availability | 🔴 High |
| Exploitability | 🟠 Medium |
| Detection Difficulty | 🟡 Moderate |
| Enterprise Risk | 🔴 High |

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# 🎯 MITRE ATT&CK

| Tactic | Technique |
|----------|-----------|
| Initial Access | T1078 – Valid Accounts |
| Execution | T1059 – Command Interpreter |
| Privilege Escalation | TA0004 |
| Persistence | T1098 |
| Lateral Movement | T1021 |

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# 📚 References

- Cisco Security Advisory
- National Vulnerability Database (NVD)
- MITRE CVE Program

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# ⚠️ Disclaimer

This repository is intended for:

- Security awareness
- Vulnerability research
- Defensive security operations
- Incident response preparation

The information provided should be used only in authorized environments and in accordance with applicable laws and organizational policies.

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