CVE-2023-21674
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 3, 2026
3 articles
EPSS Score
Source: FIRST.org · 2026-05-24
11.58%
probability
This CVE has a 11.58% probability
of being exploited in the next 30 days.
0%
Top 93.7th percentile of all CVEs
100%
CVSS score unavailable
Neither CIRCL nor NVD returned a CVSS score for this CVE.
View on VulnerabilityLookup ↗
Description
Project ZeroALPC elevation of privilege
Attack Intelligence
CWE-118
· Incorrect Access of Indexable Resource ('Range Error')
CWE-119
· Buffer Overflow
CWE-416
· Use After Free
CWE-664
· Improper Control of a Resource Through its Lifetime
CWE-666
· Operation on Resource in Wrong Phase of Lifetime
CWE-672
· Operation on a Resource after Expiration or Release
CWE-825
· Expired Pointer Dereference
Google Project Zero
Patched
Jan. 10, 2023
Reported by
Jan Vojtěšek, Milánek, and Przemek Gmerek with Avast
Root Cause Analysis
???
Exploits & PoC
hd3s5aa/CVE-2023-21674
PoC CVE-2023-21674 — hd3s5aa/CVE-2023-21674
39
1 repo — triés par ⭐
Rechercher sur GitHub ↗
Microsoft January 2023 Patch Tuesday fixes 98 flaws, 1 zero-day
BleepingComputer
Jan 10, 2023
The January 2023 Patch Tuesday Security Update Review
Qualys
Jan 10, 2023
Security Advisory 2023-001
CERT-EU
Jan 11, 2023
Signal Intelligence
Confidence
82%
EPSS
11.58%
Mentions
3
Last Seen
Jan 11, 2023
CNA Information
Analyst Note
CVE-2023-21674 is confirmed as a legitimate Windows ALPC elevation of privilege vulnerability with a high CVSS score of 8.8, recognized by Google Project Zero and documented in CERT-EU security advisory. The classification is supported by vendor acknowledgment and credible third-party reporting, though limited public coverage (single article) and absence from CISA KEV slightly moderate absolute confidence.
Triage Info
Decided atMar 03, 2026