Full Report
The defect marks the seventh actively exploited zero-day in Cisco SD-WANs this year, and the vendor has yet to release a patch. The post Cisco customers encounter another SD-WAN zero-day under attack appeared first on CyberScoop.
Analysis Summary
# Vulnerability: Cisco Catalyst SD-WAN Manager Command Injection
## CVE Details
- **CVE ID:** CVE-2026-20245
- **CVSS Score:** N/A (Pending official score, but described as a root-level command injection)
- **CWE:** CWE-20 (Improper Input Validation) / CWE-77 (Command Injection)
## Affected Systems
- **Products:** Cisco Catalyst SD-WAN Manager (formerly vManage)
- **Versions:** All versions currently in use (specific fixed version pending)
- **Configurations:** Systems where an attacker has obtained authenticated or local access.
## Vulnerability Description
The flaw is a validation error within the Cisco Catalyst SD-WAN Manager software. It allows an attacker to bypass security checks and execute arbitrary commands with **root-level privileges** on the underlying operating system. This is technical-injection defect where the software fails to properly sanitize inputs before passing them to a system shell.
## Exploitation
- **Status:** Exploited in the wild (Zero-day)
- **Complexity:** Medium (Requires existing access/credentials)
- **Attack Vector:** Network or Local (via authenticated session)
## Impact
- **Confidentiality:** High (Root access allows full data exfiltration)
- **Integrity:** High (Attackers have been observed pushing configuration changes to edge devices)
- **Availability:** High (Ability to disable or reconfigure the SD-WAN fabric)
## Remediation
### Patches
- **No patch is currently available.** Cisco has stated a fix will be provided at a future date.
### Workarounds
- **No specific workarounds exist** to mitigate the vulnerability itself.
- **Pre-emptive Mitigation:** Cisco recommends upgrading to software released in May 2026 (associated with CVE-2026-20182) to close the initial access vectors frequently used to reach this privilege escalation path.
- **Hardening:** Ensure strict access control and multi-factor authentication (MFA) for the SD-WAN Manager to prevent the initial unauthorized access required for exploitation.
## Detection
- **Indicators of Compromise:** Cisco has provided specific log entries to customers, though they warns these may mimic legitimate administrative traffic.
- **Monitoring:** Organizations should look for unauthorized configuration changes pushed from the SD-WAN Manager to edge devices.
- **Support:** Customers suspecting exploitation are encouraged to contact the Cisco Technical Assistance Center (TAC).
## References
- Cisco Security Advisory: [Pending / Not yet publicly linked in text]
- NVD Listing: [https://nvd.nist.gov/vuln/detail/CVE-2026-20245](https://nvd.nist.gov/vuln/detail/CVE-2026-20245)
- News Report: [https://cyberscoop.com/cisco-sdwan-zero-day-vulnerability-exploited-cve202620245/](https://cyberscoop.com/cisco-sdwan-zero-day-vulnerability-exploited-cve202620245/)