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Multiple Vulnerabilities in CISCO

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: CRITICAL

Systems Affected

FMC Software

Cisco Security Cloud Control (SCC) Firewall Management

Overview

Multiple vulnerabilities have been reported in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an  unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device and bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.

Target Audience: 

All IT administrators and individuals responsible for maintaining and updating in Software.

Risk Assessment:

High risk of data manipulation and service disruption.

Impact Assessment:

Potential impact on confidentiality, integrity, and availability of the system.

Description

1. Remote Code Execution Vulnerability  ( CVE-2026-20131   )

This vulnerability exists due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device.

Successful exploitation of this vulnerability could allow the attacker to execute arbitrary code on the device and elevate privileges to root.

2. Authentication Bypass Vulnerability ( CVE-2026-20079   )

This vulnerability exists due to improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device.

Successful exploitation of this vulnerability could allow the attacker to execute a variety of scripts and commands that allow root access to the device.

Solution

Apply appropriate updates as mentioned in Cisco Advisory

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2

Vendor Information

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2

References

CISCO

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2

CVE Name

CVE-2026-20131

CVE-2026-20079

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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