CVE-2026-20753CWE-190

Integer overflow in the UEFI firmware for the Slim Bootloader may allow an escalation of privilege

High · published May 12, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
2.0
In the wild
Unconfirmed
What it is

Integer overflow in the UEFI firmware for the Slim Bootloader may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00125 · 2.0th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-05-12T16:34Z
EPSS history
Timeline
  • 12 MAY 16:34Z
    Integer overflow in the UEFI firmware for the Slim Bootloader may allow an escalation of privilege
    cvelistv5