Cisco fixes SD-WAN vManage flaw exploited in zero-day attacks
A zero-day vulnerability (CVE-2026-20262) in Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) allowed authenticated remote attackers to create or overwrite files on the system, leading to root privilege escalation. The flaw affected all deployment types, including on-premises and cloud-managed versions. Cisco released security updates to fix this vulnerability and strongly advised customers to patch their systems. Indicators of compromise include attempts to upload index.jsp and .war files. This vulnerability was actively exploited in attacks prior to the patch release.
AI Analysis
Technical Summary
CVE-2026-20262 is a vulnerability in the web UI of Cisco Catalyst SD-WAN Manager caused by insufficient validation of user-supplied input during file uploads. Authenticated remote attackers could exploit this flaw by sending crafted HTTP requests to an affected API endpoint, allowing them to create or overwrite arbitrary files on the underlying operating system. This capability enables attackers to escalate privileges to root. Cisco identified exploitation of this zero-day earlier in June 2026 and released patches in multiple versions of Catalyst SD-WAN Manager to address the issue.
Potential Impact
Successful exploitation allows an authenticated remote attacker to create or overwrite any file on the system, which can be leveraged to escalate privileges to root. This compromises the integrity and control of the affected system, potentially allowing full system takeover. The vulnerability affects all deployment types of Cisco Catalyst SD-WAN Manager, including on-premises and cloud-managed environments.
Mitigation Recommendations
Cisco has released official security updates that fix this vulnerability in multiple versions of Catalyst SD-WAN Manager. Customers are strongly advised to apply these patches immediately. The affected versions fixed include 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 20.18.3.1, and 26.1.1.2, which address vulnerabilities present in all earlier versions. Administrators should also monitor logs for attempts to upload index.jsp and .war files as indicators of compromise.
Cisco fixes SD-WAN vManage flaw exploited in zero-day attacks
Description
A zero-day vulnerability (CVE-2026-20262) in Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) allowed authenticated remote attackers to create or overwrite files on the system, leading to root privilege escalation. The flaw affected all deployment types, including on-premises and cloud-managed versions. Cisco released security updates to fix this vulnerability and strongly advised customers to patch their systems. Indicators of compromise include attempts to upload index.jsp and .war files. This vulnerability was actively exploited in attacks prior to the patch release.
Affected software
pkg:github/cisco/sd-wan-vmanageRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-20262 is a vulnerability in the web UI of Cisco Catalyst SD-WAN Manager caused by insufficient validation of user-supplied input during file uploads. Authenticated remote attackers could exploit this flaw by sending crafted HTTP requests to an affected API endpoint, allowing them to create or overwrite arbitrary files on the underlying operating system. This capability enables attackers to escalate privileges to root. Cisco identified exploitation of this zero-day earlier in June 2026 and released patches in multiple versions of Catalyst SD-WAN Manager to address the issue.
Potential Impact
Successful exploitation allows an authenticated remote attacker to create or overwrite any file on the system, which can be leveraged to escalate privileges to root. This compromises the integrity and control of the affected system, potentially allowing full system takeover. The vulnerability affects all deployment types of Cisco Catalyst SD-WAN Manager, including on-premises and cloud-managed environments.
Mitigation Recommendations
Cisco has released official security updates that fix this vulnerability in multiple versions of Catalyst SD-WAN Manager. Customers are strongly advised to apply these patches immediately. The affected versions fixed include 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 20.18.3.1, and 26.1.1.2, which address vulnerabilities present in all earlier versions. Administrators should also monitor logs for attempts to upload index.jsp and .war files as indicators of compromise.
Technical Details
- Article Source
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Threat ID: 6a3033220b89be68885becc9
Added to database: 6/15/2026, 5:15:14 PM
Last enriched: 6/15/2026, 5:15:20 PM
Last updated: 6/16/2026, 6:40:23 AM
Views: 21
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