CVE-2026-20122
Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
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.
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]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- 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 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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).
None
Shell
Community reconstruction of the legacy JSON NVD Data Feeds. This project uses and redistributes data from the NVD API but is neither endorsed nor certified by the NVD.
Shell
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.
-
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
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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
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