Actively exploited in the wild
Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability
Cisco - Secure Firewall Management Center (FMC) · Listed in the CISA KEV since 2026-03-19. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVE-2026-20131
CriticalCVSS 10.0KEVSummary
Podatność w interfejsie zarządzania opartym na sieci web oprogramowania Cisco Secure Firewall Management Center (FMC) może pozwolić nieautoryzowanemu, zdalnemu atakującemu na wykonanie dowolnego kodu Java jako root na podatnym urządzeniu. Problem wynika z niebezpiecznej deserializacji strumienia bajtów Java dostarczonego przez użytkownika.
Risk Assessment
Ta podatność stwarza ryzyko wykonania dowolnego kodu na urządzeniu, co może prowadzić do eskalacji uprawnień do poziomu root. Jeśli interfejs zarządzania FMC nie ma dostępu do publicznego internetu, powierzchnia ataku związana z tą podatnością jest ograniczona.
Recommendation
Zaleca się zabezpieczenie interfejsu zarządzania FMC przed dostępem z internetu oraz monitorowanie i aktualizowanie oprogramowania w celu eliminacji tej podatności.
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Original NVD description (English source)
A vulnerability 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. This vulnerability is 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. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

