CVE-2026-20122 — AI Deep Analysis Summary

🚨 **Essence**: Cisco Catalyst SD-WAN Manager has a critical file handling flaw in its API. <br>💥 **Consequences**: Attackers can overwrite arbitrary files and escalate privileges to gain full **vmanage user access**.…

🛡️ **Root Cause**: **CWE-648** (Improper Use of Privileged APIs). <br>🔍 **Flaw**: The API interface handles file operations incorrectly, allowing unauthorized modification of system files despite permission restrictions.

🏢 **Affected Vendor**: **Cisco**. <br>📦 **Product**: **Cisco Catalyst SD-WAN Manager** (also known as Cisco SD-WAN vManage). <br>📅 **Published**: Feb 25, 2026.

🕵️ **Attacker Action**: Overwrite **arbitrary files** on the system. <br>🔑 **Privilege Gain**: Escalate from **Read-Only** access to full **vmanage user permissions**.…

⚠️ **Threshold**: **Low**. <br>🔐 **Auth Required**: Yes, but only **Read-Only (PR:L)** privileges are needed. <br>🌐 **Vector**: Network-accessible (AV:N). <br>🚫 **UI**: No user interaction required (UI:N).

📜 **Public Exploit**: **No**. <br>🚫 **PoC**: The provided data shows an empty `pocs` array. <br>🌍 **Wild Exploitation**: Currently unknown/unconfirmed based on available data.

🔍 **Self-Check**: Scan for **Cisco SD-WAN Manager** instances exposed to the network. <br>📡 **API Testing**: Verify if API endpoints allow file write operations with read-only credentials.…

🩹 **Official Fix**: **Yes**. <br>📄 **Reference**: Cisco Security Advisory **cisco-sa-sdwan-authbp-qwCX8D4v**. <br>✅ **Action**: Apply the official patch provided by Cisco immediately.

🛡️ **No Patch Workaround**: <br>1️⃣ **Restrict Access**: Block network access to the SD-WAN Manager API from untrusted zones.…

🔥 **Urgency**: **HIGH**. <br>📉 **CVSS**: 3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N. <br>💡 **Reason**: Easy exploitation (Low Complexity, Network Vector) with significant impact (Privilege Escalation).…