Vulnerabilities/CVE-2023-21773

CVE-2023-21773: Windows Kernel Elevation of Privilege Vulnerability

SSVC decisionTrack*Monitor closely. May escalate on new signals.

ExploitationNone

AutomatableNo

Technical impactTotal

Mission & well-beingHigh (assumed)

Source: CISA-ADP, SSVC v2.0.3As of 08-10-2024 18:18 UTCCISA publishes the first three inputs. Mission & well-being depends on your environment, so it is assumed at its highest: the decision is a worst case.

Modified

Published 10-01-2023Last modified 01-01-2025

On this page

Summary Timeline Description CVSS metrics EPSS trend Known exploited Public exploits Weaknesses Affected systems References

Key information

Published10-01-2023

Modified01-01-2025

SourceCVE.org

CVSS7.8

EPSS0.72%

KEV0

Exploits0

Vulnerability summary

CVE-2023-21773 is a high (CVSS 7.8) Use After Free vulnerability in microsoft windows_10_1607. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.4% of scored vulnerabilities.

Overall risk

31/100

0100

Medium · default modelHow is this calculated?

SSVC decisionTrack*Monitor closely. May escalate on new signals.

ExploitationNone

AutomatableNo

Technical impactTotal

Mission & well-beingHigh (assumed)

CVSS score

7.8/10

010

High · v3.1 (CVE.org)

EPSS score

0.72%

0%100%

Low · +0.02 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

10-01-2023
PublishedVulnerability first disclosed.
01-01-2025
Last modifiedVulnerability information updated.

Description

Windows Kernel Elevation of Privilege Vulnerability

CVSS metrics

2 scores · 2 sources · 1 version

v3.17.8

High 7.8Preferred score · CVE.org (CNA)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

SourcesAll 2 agree

NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 0.70% on 22-09-2026

100%75%50%25%0%

22-09-202622-10-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-269Improper Privilege ManagementThe product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Affected systems

Microsoft34 products

windows_10_1607na
windows_10_1809na
windows_10_20h2na
windows_10_21h2na
windows_10_22h2na

windows 10 version 1507≥ 10.0.10240.0, < 10.0.10240.19685
windows 10 version 1607≥ 10.0.14393.0, < 10.0.14393.5648
windows 10 version 1809≥ 10.0.17763.0, < 10.0.17763.3887 | ≥ 10.0.0, < 10.0.17763.3887
windows 10 version 20h2≥ 10.0.0, < 10.0.19042.2486
windows 10 version 21h2≥ 10.0.19043.0, < 10.0.19044.2486
windows 10 version 22h2≥ 10.0.19045.0, < 10.0.19045.2486
windows_11_21h2na
windows_11_22h2na
windows 11 version 21h2≥ 10.0.0, < 10.0.22000.1455
windows 11 version 22h2≥ 10.0.22621.0, < 10.0.22621.1105
windows_7≥ 6.1.0, < 6.1.7601.26321 | na
windows 7 service pack 1≥ 6.1.0, < 6.1.7601.26321
windows_8.1≥ 6.3.0, < 6.3.9600.20778 | na
windows_rt_8.1na
windows_server_2008na | r2:sp1
windows server 2008 service pack 2≥ 6.0.6003.0, < 6.0.6003.21872
windows server 2008 r2 service pack 1≥ 6.1.7601.0, < 6.1.7601.26321
windows server 2008 r2 service pack 1 (server core installation)≥ 6.1.7601.0, < 6.1.7601.26321
windows server 2008 service pack 2≥ 6.0.6003.0, < 6.0.6003.21872
windows server 2008 service pack 2 (server core installation)≥ 6.0.6003.0, < 6.0.6003.21872
windows server 2012≥ 6.2.9200.0, < 6.2.9200.24075 | na | r2
windows server 2012 r2≥ 6.3.9600.0, < 6.3.9600.20778
windows server 2012 r2 (server core installation)≥ 6.3.9600.0, < 6.3.9600.20778
windows server 2012 (server core installation)≥ 6.2.9200.0, < 6.2.9200.24075
windows server 2016≥ 10.0.14393.0, < 10.0.14393.5648 | na
windows server 2016 (server core installation)≥ 10.0.14393.0, < 10.0.14393.5648
windows server 2019≥ 10.0.17763.0, < 10.0.17763.3887 | na
windows server 2019 (server core installation)≥ 10.0.17763.0, < 10.0.17763.3887
windows server 2022≥ 10.0.20348.0, < 10.0.20348.1487 | na

Show all 34Show top 5

1 vendor · 34 products

References

1 links

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21773Vendor Advisory

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