What is CVE-2023-21563?
BitLocker Security Feature Bypass Vulnerability
Its CVSS v3 base vector states that the flaw requires physical access to the device, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1381 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.8 — MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - EPSS (FIRST)
- 1.5% probability of exploitation in the next 30 days, higher than 74.3% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 8.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2023-01-10, last modified 2025-01-01
Is CVE-2023-21563 being exploited?
Weaponised exploit code for CVE-2023-21563 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.
- c-sprinks/bitlocker-bypass-research (github)
- LR2006-Robot/bitpixie (github)
- trickest/cve (trickest)
Affected products and versions
- Microsoft: Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 20H2, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016
How to fix CVE-2023-21563
No vendor patch reference has been recorded for CVE-2023-21563 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2023-21563
1 tracked threat in the Threadlinqs corpus references CVE-2023-21563, either in the campaign’s CVE list or as an indicator on the campaign record.
- CVE-2026-50661: Windows BitLocker Security Feature Bypass 0-Day — MEDIUM · 2026-07-15
Sources
Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on .