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5.4
MEDIUM CVSS 3.1
CVE-2026-20122
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
Overview
Description

A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is 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.

Details
INFO

Published Date :

Feb. 25, 2026, 5:25 p.m.

Last Modified :

March 4, 2026, 9:25 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-20122 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco catalyst_sd-wan_manager
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 MEDIUM [email protected]
Solution
Apply vendor patches to address arbitrary file overwrite vulnerability in Cisco Catalyst SD-WAN Manager.
  • Update Cisco Catalyst SD-WAN Manager software.
  • Apply security patches provided by the vendor.
  • Restrict API access to trusted sources.
  • Monitor for unauthorized file modifications.
Public PoC/Exploit Available at Github

CVE-2026-20122 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20122.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20122 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20122 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
PyramidOfPain/CISA-ED-26-03

None

Shell

Updated: 2 weeks, 3 days ago
0 stars 0 fork 0 watcher
Born at : Feb. 27, 2026, 2:27 p.m. This repo has been linked 4 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20122 vulnerability anywhere in the article.

  • Help Net Security
Week in review: Weaponized OAuth redirection logic delivers malware, Patch Tuesday forecast

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: BlacksmithAI: Open-source AI-powered penetration testing framework BlacksmithAI is an open-source pene ... Read more

Published Date: Mar 08, 2026 (1 week, 4 days ago)
  • TheCyberThrone
Cisco Catalyst SD-WAN — Active Exploitation Alert

March 7, 2026What HappenedCisco released security patches on February 25 for five Catalyst SD-WAN vulnerabilities. On March 5, the company updated its advisory to warn that two of them — CVE-2026-2012 ... Read more

Published Date: Mar 07, 2026 (1 week, 6 days ago)
  • The Register
Cisco warns of two more SD-WAN bugs under active attack

Just when network admins thought the Cisco SD-WAN patch queue might finally be shrinking, Switchzilla has confirmed miscreants are exploiting more vulnerabilities in its SD-WAN management software. Th ... Read more

Published Date: Mar 06, 2026 (1 week, 6 days ago)
  • Help Net Security
March 2026 Patch Tuesday forecast: Is AI security an oxymoron?

Developers and analysts are using more AI tools to produce code and to test both the performance and security of the finished products. They are also embedding AI functionality in their products direc ... Read more

Published Date: Mar 06, 2026 (1 week, 6 days ago)
  • The Hacker News
Cisco Confirms Active Exploitation of Two Catalyst SD-WAN Manager Vulnerabilities

Cisco has disclosed that two more vulnerabilities affecting Catalyst SD-WAN Manager (formerly SD-WAN vManage) have come under active exploitation in the wild. The vulnerabilities in question are liste ... Read more

Published Date: Mar 05, 2026 (2 weeks ago)
  • Help Net Security
Cisco warns of SD-WAN Manager exploitation, fixes 48 firewall vulnerabilities

Cisco has confirmed that two Catalyst SD-WAN Manager vulnerabilities (CVE-2026-20128 and CVE-2026-20122) patched in late February 2025 are being exploited by attackers. The exploited vulnerabilities ( ... Read more

Published Date: Mar 05, 2026 (2 weeks ago)
  • security.nl
Cisco meldt ook misbruik van andere Catalyst SD-WAN-kwetsbaarheden

Twee kritieke kwetsbaarheden in Cisco Catalyst SD-WAN Manager worden actief misbruikt bij aanvallen, zo waarschuwt Cisco. Updates voor de problemen zijn sinds 25 februari beschikbaar. De Cisco Catalys ... Read more

Published Date: Mar 05, 2026 (2 weeks ago)
  • CybersecurityNews
Cisco Catalyst SD-WAN Vulnerabilities Allow Attackers to Gain Root Access

Cisco Catalyst SD-WAN Vulnerabilities An urgent security advisory from Cisco warns that multiple vulnerabilities in Cisco Catalyst SD-WAN Manager could allow attackers to bypass authentication, gain r ... Read more

Published Date: Mar 05, 2026 (2 weeks ago)
  • Daily CyberSecurity
Under Attack: Cisco Urges Immediate Action as Hackers Actively Exploit SD-WAN Manager Flaws

Cisco has issued an urgent update to its security advisory, warning that two vulnerabilities in the Cisco Catalyst SD-WAN Manager are now being actively exploited by hackers in the wild. The vulnerabi ... Read more

Published Date: Mar 05, 2026 (2 weeks, 1 day ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-20122 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Mar. 04, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
    Added CPE Configuration OR *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions up to (excluding) 20.9.8.2 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions from (including) 20.11 up to (excluding) 20.12.5.3 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions from (including) 20.13 up to (excluding) 20.15.4.2 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions from (including) 20.16 up to (excluding) 20.18.2.1 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.6:*:*:*:*:*:*:*
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v Types: Vendor Advisory
  • New CVE Received by [email protected]

    Feb. 25, 2026

    Action Type Old Value New Value
    Added Description A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is 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.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
    Added CWE CWE-648
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.4
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact