Full Report
Cisco security advisory (AV26-551)
Analysis Summary
# Vulnerability: Cisco Catalyst SD-WAN Manager Authenticated Privilege Escalation
## CVE Details
- **CVE ID:** CVE-2026-20245
- **CVSS Score:** 8.8 (High)
- **CWE:** CWE-269 (Improper Privilege Management)
## Affected Systems
- **Products:** Cisco Catalyst SD-WAN Manager (formerly vManage)
- **Versions:** Specific software versions prior to the fixed releases (check vendor documentation for exact version strings as they relate to the 20.x branch).
- **Configurations:** Systems where the multi-tenant or single-tenant management interface is accessible and where users have valid, low-privileged credentials.
## Vulnerability Description
A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager allows an authenticated, remote attacker to gain elevated privileges. The flaw exists due to improper authorization checks when certain API requests or configuration changes are processed. An attacker with low-level administrative or "read-only" privileges can bypass those restrictions to gain full "r/w" (root/provider) administrative access to the management console.
## Exploitation
- **Status:** Not exploited (Current reports indicate no active exploitation in the wild at the time of the advisory release).
- **Complexity:** Low
- **Attack Vector:** Network
## Impact
- **Confidentiality:** High (Full access to all tenant data and network configurations).
- **Integrity:** High (Ability to modify network policies and system settings).
- **Availability:** High (Potential to disrupt SD-WAN fabric and management services).
## Remediation
### Patches
Cisco has released software updates to address this vulnerability. It is recommended to migrate to the following versions (or later):
- Cisco Catalyst SD-WAN Manager versions as specified in the official Cisco Advisory `cisco-sa-sdwan-privesc-4uxFrdzx`.
### Workarounds
- There are no technical workarounds for this vulnerability.
- **Mitigation Strategy:** Restrict access to the SD-WAN Manager web-based interface to trusted internal networks or via a VPN/Management jump host. Adhere to the principle of least privilege for all user accounts.
## Detection
- **Indicators of Compromise:** Review audit logs for unusual configuration changes originated by user accounts that typically have restricted permissions.
- **Detection methods:** Monitor for unauthorized calls to the `/dataservice/` API endpoints from non-standard administrative IP addresses.
## References
- Cisco Security Advisory: [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-privesc-4uxFrdzx]
- Cisco Security Portal: [https://tools.cisco.com/security/center/publicationListing.x]
- Canadian Centre for Cyber Security Bulletin (AV26-551): [https://www.cyber.gc.ca/en/alerts-advisories/cisco-security-advisory-av26-551]