# CVE-2021-46747: AMD Secure Processor privilege escalation via insufficient SMN access control

Source: https://junglewise.ai/threats/cve-2021-46747-amd-secure-processor-privilege-escalation-via-insufficient-smn  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-01. Updated: 2026-06-01  
License: CC BY 4.0 with a link back

CVE-2021-46747 · Severity: info · CVSS 7.1 · Published 2026-06-01

A security flaw in the AMD Secure Processor, a dedicated security chip within AMD processors, could allow a malicious user with high-level system access to bypass certain security boundaries. By exploiting improper access controls, an attacker could gain unauthorized access to sensitive internal management networks. This could lead to a full escalation of privileges, potentially allowing the attacker to compromise the entire system's integrity and data.

Technologies: [Amd Secure Processor](https://junglewise.ai/threats/technologies/secure-processor). Vendors: [Amd](https://junglewise.ai/threats/vendors/amd).

## Quick answers

**Is CVE-2021-46747 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-46747 being exploited in the wild.

**How severe is CVE-2021-46747?** Informational severity, with a CVSS score of 7.1, published 1 June 2026.

**Which products and versions are affected?** AMD Secure Processor (ASP).

**Is there a fix for CVE-2021-46747?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-46747 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2021-46747?** Check whether you run Amd Secure Processor. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is classified as insufficient granularity of access control (CWE-1220) within the AMD Secure Processor (ASP). The flaw resides in how the ASP manages access to the System Management Network (SMN) apertures. A local attacker running an untrusted user-space application with high privileges could exploit this lack of granularity to map sensitive SMN regions that should otherwise be restricted. Successful exploitation allows for unauthorized access to internal hardware communication channels, potentially resulting in a complete escalation of privileges and compromise of the host environment. AMD has addressed this issue in security bulletins AMD-SB-4017 and AMD-SB-6027.

## Affected products

- AMD Secure Processor (ASP)

## Timeline

- 2026-06-01: advisory: NVD publication date

## References

- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4017.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4017.html)
- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-6027.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-6027.html)

## Related threats

- [AMD Secure Processor TEE DrvSys out-of-bounds write](https://junglewise.ai/threats/cve-2024-36344-insufficient-parameter-sanitization-in-amd-secure-processor-asp)
- [AMD Secure Processor improper privilege handling](https://junglewise.ai/threats/cve-2025-54511-amd-secure-processor-improper-privilege-handling)
- [AMD Secure Processor memory corruption in ASP firmware](https://junglewise.ai/threats/cve-2023-31317-amd-secure-processor-memory-corruption-in-asp-firmware)
- [AMD Secure Processor integrity loss during power save/restore](https://junglewise.ai/threats/cve-2023-31316-amd-secure-processor-integrity-loss-during-power-save-restore)