---
id: "CVE-2026-20122"
kind: "vulnerability"
aliases: ["CVE-2026-20122"]
title: "A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to\u2026"
severity: "high"
cvss: 5.4
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Cisco Catalyst SD-WAN Manger", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "cisco catalyst sd-wan manager", "fixed": ["20.9.8.2"], "affected": "< 20.9.8.2", "ecosystem": "vendor"}, {"name": "cisco catalyst sd-wan manager", "fixed": ["20.12.5.3"], "affected": ">= 20.10, < 20.12.5.3", "ecosystem": "vendor"}, {"name": "cisco catalyst sd-wan manager", "fixed": ["20.15.4.2"], "affected": ">= 20.13, < 20.15.4.2", "ecosystem": "vendor"}, {"name": "cisco catalyst sd-wan manager", "fixed": ["20.18.2.1"], "affected": ">= 20.16, < 20.18.2.1", "ecosystem": "vendor"}, {"name": "cisco catalyst sd-wan manager", "fixed": [], "affected": "= 20.12.6", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["catalyst-sd-wan-manager", "cisco", "exploited", "infrastructure", "sd-wan"]
not_affected_if: ["unknown"]
published_at: "2026-02-25T17:25:28+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20122", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20122", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to…

Cisco Catalyst SD-WAN Manager has an incorrect use of privileged APIs flaw where improper file handling on the API lets an attacker upload a malicious file. A successful exploit lets the attacker overwrite arbitrary files and gain vmanage user privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Cisco Catalyst SD-WAN Manger affected ? fixed ?
- vendor:cisco catalyst sd-wan manager affected < 20.9.8.2 fixed 20.9.8.2
- vendor:cisco catalyst sd-wan manager affected >= 20.10, < 20.12.5.3 fixed 20.12.5.3
- vendor:cisco catalyst sd-wan manager affected >= 20.13, < 20.15.4.2 fixed 20.15.4.2
- vendor:cisco catalyst sd-wan manager affected >= 20.16, < 20.18.2.1 fixed 20.18.2.1
- vendor:cisco catalyst sd-wan manager affected = 20.12.6 fixed ?

## How to check

Follow CISA's Emergency Directive 26-03 and 'Hunt & Hardening Guidance for Cisco SD-WAN Devices' referenced in the CISA notice.

## Fix

Follow CISA's Emergency Directive 26-03 mitigation guidance for Cisco SD-WAN devices; unknown fixed version in the sources.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20122
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-20122

## From the sources

Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.

CISA required action: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines 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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_