Cisco fixes SD-WAN vManage flaw exploited in zero-day attacks
CVE-2026-20262 is a vulnerability in Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) that allows authenticated remote attackers to create or overwrite files on the system via crafted HTTP requests, enabling escalation to root privileges. The flaw affects multiple versions across several release lines and was actively exploited in zero-day attacks. Cisco has released security updates to address this issue and strongly advises customers to apply patches. The vulnerability impacts all deployment types, including on-premises and cloud-managed environments.
AI Analysis
Technical Summary
Cisco Catalyst SD-WAN Manager contains a vulnerability (CVE-2026-20262) due to insufficient validation of user-supplied input during file uploads. An authenticated remote attacker can exploit this flaw by sending crafted HTTP requests to an affected API endpoint, allowing arbitrary file creation or overwriting on the underlying operating system. This capability can be leveraged to escalate privileges to root. The vulnerability affects multiple versions prior to fixed releases and was exploited in zero-day attacks before patches were available. Cisco's advisory includes indicators of compromise and recommends patching affected systems promptly.
Potential Impact
Successful exploitation allows an authenticated attacker to create or overwrite any file on the filesystem of the affected system, which can be used to escalate privileges to root. This can lead to full system compromise of the Cisco Catalyst SD-WAN Manager, potentially impacting network management and security controls.
Mitigation Recommendations
Cisco has released official security updates that fix this vulnerability in multiple release lines. Customers should apply the patches corresponding to their affected versions immediately. Cisco strongly advises patching to prevent exploitation. No alternative mitigations or workarounds are specified. Patch status is confirmed by Cisco's advisory.
Cisco fixes SD-WAN vManage flaw exploited in zero-day attacks
Description
CVE-2026-20262 is a vulnerability in Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) that allows authenticated remote attackers to create or overwrite files on the system via crafted HTTP requests, enabling escalation to root privileges. The flaw affects multiple versions across several release lines and was actively exploited in zero-day attacks. Cisco has released security updates to address this issue and strongly advises customers to apply patches. The vulnerability impacts all deployment types, including on-premises and cloud-managed environments.
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
Cisco Catalyst SD-WAN Manager contains a vulnerability (CVE-2026-20262) due to insufficient validation of user-supplied input during file uploads. An authenticated remote attacker can exploit this flaw by sending crafted HTTP requests to an affected API endpoint, allowing arbitrary file creation or overwriting on the underlying operating system. This capability can be leveraged to escalate privileges to root. The vulnerability affects multiple versions prior to fixed releases and was exploited in zero-day attacks before patches were available. Cisco's advisory includes indicators of compromise and recommends patching affected systems promptly.
Potential Impact
Successful exploitation allows an authenticated attacker to create or overwrite any file on the filesystem of the affected system, which can be used to escalate privileges to root. This can lead to full system compromise of the Cisco Catalyst SD-WAN Manager, potentially impacting network management and security controls.
Mitigation Recommendations
Cisco has released official security updates that fix this vulnerability in multiple release lines. Customers should apply the patches corresponding to their affected versions immediately. Cisco strongly advises patching to prevent exploitation. No alternative mitigations or workarounds are specified. Patch status is confirmed by Cisco's advisory.
Technical Details
- Article Source
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Threat ID: 6a3033220b89be68885becc9
Added to database: 06/15/2026, 17:15:14 UTC
Last enriched: 06/23/2026, 14:13:25 UTC
Last updated: 07/19/2026, 17:26:47 UTC
Views: 226
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