# CVE-2023-20576: AMD AGESA insufficient verification of data authenticity in SPI ROM

Source: https://junglewise.ai/threats/cve-2023-20576-amd-agesa-insufficient-verification-of-data-authenticity-in-spi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-02. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2023-20576 · Severity: high · CVSS 7.7 · Published 2026-09-02

AMD AGESA is firmware used to initialize and configure processors. Insufficient verification of SPI ROM data allows attackers to modify firmware, leading to denial of service or privilege escalation that compromises system integrity and control.

Vendors: [Amd](https://junglewise.ai/threats/vendors/amd).

## Quick answers

**Is CVE-2023-20576 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-20576 being exploited in the wild.

**How severe is CVE-2023-20576?** High severity, with a CVSS score of 7.7, published 2 September 2026.

**Which products and versions are affected?** Amd AGESA <UNKNOWN>.

**Is there a fix for CVE-2023-20576?** 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-2023-20576 attacked?** It is attacked with local access or with physical access.

**Am I affected by CVE-2023-20576?** Check whether you run Amd AGESA at an affected version. 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 an insufficient data authenticity verification flaw in AMD AGESA firmware. The root cause is inadequate validation of SPI ROM data before use, allowing an attacker with physical or elevated local access to modify firmware without detection. An attacker can update SPI ROM contents to execute malicious code or corrupt critical firmware functionality, resulting in denial of service or privilege escalation depending on execution context. Patches are expected to be available from AMD through official security bulletins.

## Affected products

- AMD AGESA <UNKNOWN>

## Timeline

- 2026-09-02: disclosed
- 2026-09-02: advisory: AMD security bulletin SB-7009

## References

- [https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7009.html](https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7009.html)

## Related threats

- [AMD AGESA Bootloader Firmware insecure default configuration in DDR5 PMIC](https://junglewise.ai/threats/cve-2025-48516-amd-agesa-bootloader-firmware-insecure-default-configuration-in)