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.
CVSS Vector Breakdown
AV:NAttack VectorAC:LAttack ComplexityPR:LPrivileges RequiredUI:NUser InteractionS:UScopeC:LConfidentialityI:LIntegrityA:NAvailabilityWeaknesses
Affected Products
Exploitability
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.
Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.
View exploit detailsReferences
- Cisco Patches Another SD-WAN Zero-Day Exploited in Attacksen-us·SecurityWeek· Summary only·
- Cisco Releases Security Updates for Actively Exploited SD-WAN Manager Flawen·The Hacker News·
- Cisco fixes SD-WAN vManage flaw exploited in zero-day attacksen-us·BleepingComputer· Summary only·
- Cisco Catalyst SD-WAN Manager CVE-2026-20245 Flaw Actively Exploited – No Patch Availableen·The Hacker News· Summary only·
- Cisco warns of unpatched SD-WAN zero-day exploited in attacksen-us·BleepingComputer· Summary only·
- Cisco Warns of 7th SD-WAN Zero-Day Exploited in 2026en-us·SecurityWeek· Summary only·
- Ongoing exploitation of Cisco Catalyst SD-WAN vulnerabilitiesen·Cisco Talos·
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