Is CVE-2023-20577 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2023-20577 being exploited in the wild.

How severe is CVE-2023-20577?

High severity, with a CVSS score of 7.4, published 2 September 2026.

Is there a fix for CVE-2023-20577?

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-2023-20577 attacked?

It is attacked with physical access.

Am I affected by CVE-2023-20577?

Check whether anything you run is named in the advisory. 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.

CVE-2023-20577: AMD firmware heap overflow in SMM module

CVE-2023-20577 · Severity: high · CVSS 7.4 · Published 2026-09-02

A memory safety flaw in AMD firmware's System Management Mode (SMM) can be exploited to execute malicious code if an attacker first gains the ability to write to SPI flash memory. Successful exploitation could allow attackers to bypass security protections and gain deep control over affected systems.

Quick answers

Is CVE-2023-20577 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2023-20577 being exploited in the wild.
How severe is CVE-2023-20577?: High severity, with a CVSS score of 7.4, published 2 September 2026.
Which products and versions are affected?: AMD firmware <UNKNOWN>.
Is there a fix for CVE-2023-20577?: 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-2023-20577 attacked?: It is attacked with physical access.
Am I affected by CVE-2023-20577?: Check whether anything you run is named in the advisory. 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

A heap overflow exists in the SMM (System Management Mode) module of AMD firmware. The vulnerability requires a chained attack: an attacker must first exploit a separate SPI flash write vulnerability to modify firmware, then trigger the heap overflow to execute arbitrary code. Attack vectors include firmware modification and memory corruption. No patch status is specified in the provided advisory data.

Affected products

AMD firmware <UNKNOWN>

Timeline

2026-09-02: disclosed

References

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

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