Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.   The vulnerabilities tracked by CVE-2026-20330 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.9",
  "pubDate": "2026-09-16T20:17:23.810Z",
  "pubdate": "2026-09-16T20:17:23.810Z",
  "executiveSummary": "CVE-2026-20330 identifies a set of vulnerabilities originating from improper neutralization issues classified under CWE-707 within the Cisco Secure Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, and Cisco Secure Firewall Management Center (FMC) Software.\nThese vulnerabilities, discovered during an internal security review, represent flaws in how the software handles input sanitization and data processing, potentially allowing for the injection of malicious payloads or unintended command execution.\nThe impact of these flaws spans across critical infrastructure components, potentially compromising the integrity and security posture of the affected network security appliances.\nThe risk implication is significant as improper neutralization often serves as an entry vector for broader system compromise, including unauthorized access or service disruption.\nAttackers targeting these vulnerabilities would typically require the ability to interact with specific interfaces or processes prone to the lack of adequate input validation, although specific authentication and privilege requirements are contingent on the specific input vectors affected.",
  "technicalDetails": "CVE-2026-20330 concerns improper neutralization, a category of vulnerabilities rooted in the failure to correctly sanitize, filter, or validate input before it is processed by the application's underlying logic. By failing to neutralize data, the application potentially treats untrusted input as trusted instructions, code, or control sequences.\nThe vulnerability manifests within the input processing pipelines of Cisco Secure Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, and Cisco Secure Firewall Management Center (FMC) Software. The root cause is the reliance on incomplete or insufficient sanitization routines when handling complex data structures or inter-process communication.\nThe attack flow for these neutralization issues typically begins with an attacker supplying a malformed or malicious payload via a supported interface or protocol handled by the vulnerable component. Because the application logic fails to distinguish between data and control elements, the payload is parsed and executed within the context of the application's execution environment.\nIn the context of CWE-707, this indicates that the software does not properly handle the semantic or syntactic structure of input, leading to unexpected behavior such as buffer manipulation, injection of command sequences, or logical bypasses. When the application interprets these inputs, it may inadvertently permit the modification of control flow or the alteration of sensitive internal data structures.\nPost-exploitation impact is multifaceted. Successful neutralization bypasses can lead to privilege escalation if the affected process operates with elevated permissions, or allow for remote code execution (RCE) if the injected content is treated as executable code. Furthermore, because these vulnerabilities exist in security-critical appliances, they could be leveraged to bypass firewall rules, intercept encrypted traffic, or establish persistence within the network perimeter.\nThe vulnerabilities necessitate a deep analysis of how data is passed between the management plane, control plane, and data plane within these appliances. The lack of robust input encoding and contextual validation means that even standard administrative interfaces or diagnostic services could be vectors for exploitation if they accept unsanitized user-supplied data."
}