Is CVE-2026-20753 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-20753 being exploited in the wild.

How severe is CVE-2026-20753?

Informational severity, with a CVSS score of 8.7, published 12 May 2026.

Which products and versions are affected?

Intel Slim Bootloader Versions prior to hash 193129e6a1ea675527670785c8c75ed09b423211 (01/22/2026).

Is there a fix for CVE-2026-20753?

A patch was published on 2026-01-22: Date of the recommended firmware hash fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-20753 attacked?

It is attacked with local access, in device firmware.

Am I affected by CVE-2026-20753?

Check whether you run Intel Slim Bootloader 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.

CVE-2026-20753: Intel Slim Bootloader integer overflow in UEFI firmware

CVE-2026-20753 · Severity: info · CVSS 8.7 · Published 2026-05-12

A vulnerability in the Intel Slim Bootloader, which is responsible for initializing hardware and launching the operating system, could allow an attacker to gain higher-level system privileges. An attacker who already has administrative access to the system software could exploit this flaw to execute unauthorized code at the firmware level. This could lead to a complete compromise of the system's security, including the ability to bypass operating system protections and access sensitive data.

Technologies: Intel Slim Bootloader. Vendors: Intel.

Quick answers

Is CVE-2026-20753 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-20753 being exploited in the wild.
How severe is CVE-2026-20753?: Informational severity, with a CVSS score of 8.7, published 12 May 2026.
Which products and versions are affected?: Intel Slim Bootloader Versions prior to hash 193129e6a1ea675527670785c8c75ed09b423211 (01/22/2026).
Is there a fix for CVE-2026-20753?: A patch was published on 2026-01-22: Date of the recommended firmware hash fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-20753 attacked?: It is attacked with local access, in device firmware.
Am I affected by CVE-2026-20753?: Check whether you run Intel Slim Bootloader 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

An integer overflow vulnerability (CWE-190) exists within the UEFI firmware component of the Intel Slim Bootloader. The flaw is triggered during local access by a high-privileged system software adversary. By exploiting this overflow, an attacker can achieve local code execution within the firmware environment, bypassing higher-level security boundaries. The attack is characterized by low complexity but requires specific 'attack requirements' (preconditions) to be present. Intel has released a firmware update to mitigate this issue, identified by a specific commit hash from January 2026.

Affected products

Intel Slim Bootloader Versions prior to hash 193129e6a1ea675527670785c8c75ed09b423211 (01/22/2026)

Timeline

2026-01-22: patched: Date of the recommended firmware hash fix
2026-05-12: disclosed: Initial release of Intel-SA-01425
2026-05-12: advisory: NVD publication date

References

https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01425.html

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