Common Weakness Enumeration

CWE-455

Allowed

Non-exit on Failed Initialization

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product does not exit or otherwise modify its operation when security-relevant errors occur during initialization, such as when a configuration file has a format error or a hardware security module (HSM) cannot be activated, which can cause the product to execute in a less secure fashion than intended by the administrator.

4 vulnerabilities reference this CWE, most recent first.

CVE-2026-16584 (GCVE-0-2026-16584)

Vulnerability from cvelistv5 – Published: 2026-07-23 15:34 – Updated: 2026-07-23 18:16
VLAI
Title
AWS API MCP Server Security Policy Bypass via Startup Failure
Summary
Improper handling of an initialization failure in AWS API MCP Server from 0.2.13 through 1.3.46 might allow an actor to bypass the user-configured security policy and execute AWS API operations that the policy was set to deny or gate. When initialization of the security policy enforcement data fails at server startup, the policy check is skipped for the lifetime of the process. IAM permissions on the configured credentials remain in effect and are unaffected. To remediate this issue, users should upgrade to version 1.3.47.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.3 (High)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-455 - Non-exit on failed initialization
Assigner
References
Impacted products
Vendor Product Version
AWS aws-api-mcp-server Affected: 0.2.13 , < 1.3.47 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2022-4662 (GCVE-0-2022-4662)

Vulnerability from cvelistv5 – Published: 2022-12-22 00:00 – Updated: 2025-04-09 18:36
VLAI
Summary
A flaw incorrect access control in the Linux kernel USB core subsystem was found in the way user attaches usb device. A local user could use this flaw to crash the system.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a Kernel Affected: Linux kernel 6.0-rc4
Show details on NVD website
To clipboard 

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GHSA-29W2-FQ35-V728

Vulnerability from github – Published: 2026-07-24 22:33 – Updated: 2026-07-24 22:33
VLAI
Summary
AWS API MCP Server Security Policy Bypass via Startup Initialization Failure
Details

Summary

The AWS API MCP Server is an open source Model Context Protocol (MCP) server that enables AI assistants to interact with AWS services and resources through AWS CLI commands. It provides programmatic access to manage your AWS infrastructure while maintaining proper security controls. It includes an optional, user-configured security policy that can deny or gate specific AWS operations. An issue exists where, if the data used to enforce this policy fails to initialize at server startup, the per-request policy check is silently skipped for the lifetime of the process.

Impact

On startup, the server loads data used to enforce the configured security policy. If that load fails, the server continues running without the enforcement data in place. In the default configuration, the per-request security check is then bypassed for the lifetime of the process: configured deny and gate rules are not consulted, and AWS API operations the policy was intended to restrict execute without enforcement. The scope is limited to the security-policy gate; IAM permissions on the configured credentials remain in effect and continue to bound what the server can do.

Impacted versions: >= 0.2.13 AND < 1.3.47

Patches

This issue has been addressed in awslabs.aws-api-mcp-server version 1.3.47. AWS recommends upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds

Any one of the following prevents the bypass until you can upgrade:

  • Use least-privilege IAM credentials (for example, a ReadOnlyAccess role) scoped to the task. IAM remains the primary access control and is enforced regardless of this issue.
  • If the server started during degraded connectivity, restart it once connectivity is restored so the policy enforcement data loads successfully.

Contact

If you have any questions or comments about this advisory, AWS asks that you contact AWS Security via the reporting page or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Acknowledgement

We would like to thank Lav Kumar Vishwakarma (independent security researcher) for collaborating on this issue through the coordinated vulnerability disclosure process.

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.3 (High)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

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GHSA-GCM2-9M6W-M6MJ

Vulnerability from github – Published: 2022-12-23 00:30 – Updated: 2025-04-09 21:30
VLAI
Details

A flaw incorrect access control in the Linux kernel USB core subsystem was found in the way user attaches usb device. A local user could use this flaw to crash the system.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

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}
Mitigation
Implementation

Follow the principle of failing securely when an error occurs. The system should enter a state where it is not vulnerable and will not display sensitive error messages to a potential attacker.

No CAPEC attack patterns related to this CWE.

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