Ethical Hacking News
A new critical vulnerability has been discovered in Cisco SD-WAN Manager, allowing authenticated attackers to gain root-level access to affected systems via file upload command injection. Organizations relying on Cisco SD-WAN for their network infrastructure are advised to take immediate action to patch their systems and ensure they are not vulnerable to this critical security flaw.
Cisco Systems has disclosed a critical root-level vulnerability in its SD-WAN Manager platform. The vulnerability, CVE-2026-20245, allows an authenticated local attacker to gain root-level access to the affected system. Exploitation can be done using stolen credentials or leveraging previously disclosed vulnerabilities. The impact of this vulnerability affects Cisco Catalyst SD-WAN Manager across all deployment models. Cisco has released interim guidance to patch the vulnerability, but running a software update alone may not be sufficient. Organizations are advised to review logs and open a Technical Assistance Center (TAC) case to mitigate the risk of exploitation.
Cisco Systems, a leading provider of networking equipment and software solutions, has recently disclosed a critical root-level vulnerability in its SD-WAN Manager platform. This security flaw, identified as CVE-2026-20245, poses a significant threat to network administrators and organizations relying on Cisco SD-WAN for their network infrastructure.
According to the disclosure, the vulnerability allows an authenticated local attacker to trigger a file upload command injection attack, effectively gaining root-level access to the affected system. This means that an attacker with netadmin privileges can exploit the vulnerability using stolen credentials or by leveraging previously disclosed vulnerabilities such as CVE-2026-20182 and CVE-2026-20127.
The mechanics behind this vulnerability are rooted in insufficient validation of user-supplied input. An attacker could exploit this weakness by uploading a crafted file to the affected system, which would enable them to perform command injection attacks on an affected system and elevate their privileges as the root user.
The impact of this vulnerability extends beyond individual systems, as it affects Cisco Catalyst SD-WAN Manager across all deployment models, including on-premises installations, Cisco SD-WAN Cloud-Pro, Cisco-managed cloud deployments, and FedRAMP environments. This widespread exposure highlights the need for organizations to take immediate action to patch their systems and ensure they are not vulnerable to this critical security flaw.
In response to the disclosure, Cisco has released interim guidance that advises administrators to run the request admin-tech command on every control component in their SD-WAN deployment before upgrading to the fixed release. However, this advisory warns that applying a software update alone may not be sufficient to resolve the vulnerability, as it may have already resulted in a compromised system.
To mitigate this risk, organizations are advised to carefully review and compare logs from the vconfd_script_upload_tenant_list.sh script at /var/log/ for entries referencing vconfd_script_upload_tenant_list.sh. It is also recommended that administrators open a Technical Assistance Center (TAC) case and bring the admin-tech file with them, as Cisco is not aware of successful exploitation by other methods.
The revelation of this vulnerability has significant implications for organizations relying on Cisco SD-WAN for their network infrastructure. As such, it serves as a reminder to prioritize network security and take proactive measures to patch vulnerabilities before they are exploited. By doing so, organizations can minimize the risk of a potential attack and protect themselves from the potential consequences of this critical root-level vulnerability.
Related Information:
https://www.ethicalhackingnews.com/articles/Cisco-SD-WAN-Vulnerability-Exposed-A-Critical-Root-Level-Threat-to-Network-Security-ehn.shtml
https://securityaffairs.com/193203/security/cisco-sd-wan-has-a-new-root-level-problem-and-theres-no-fix-yet.html
https://nvd.nist.gov/vuln/detail/CVE-2026-20182
https://www.cvedetails.com/cve/CVE-2026-20182/
https://nvd.nist.gov/vuln/detail/CVE-2026-20127
https://www.cvedetails.com/cve/CVE-2026-20127/
https://nvd.nist.gov/vuln/detail/CVE-2026-20245
https://www.cvedetails.com/cve/CVE-2026-20245/
Published: Fri Jun 5 10:27:04 2026 by llama3.2 3B Q4_K_M
