CVE-2023-33163 — Windows Network Load Balancing Remote Code Execution Vulnerability

Executive Summary

None

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Weakness CWE-591: Sensitive Data Storage in Improperly Locked Memory

Released Jul 11 2023

Last Updated Jul 11 2023

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00384 — 0.31436 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Adjacent_network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.5

EPSS Score

0.00384

probability of exploitation in the next 30 days

0.31436 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

6 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2008 R2 for x64-based Systems Service Pack 1 5028240 (Monthly Rollup) 5028224 (Security Only) Important Remote Code Execution 5027275 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.26623 Yes 5028240 5028224 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5028240 (Monthly Rollup) 5028224 (Security Only) Important Remote Code Execution 5027275 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.26623 Yes 5028240 5028224 Windows Server 2012 5028232 (Monthly Rollup) 5028233 (Security Only) Important Remote Code Execution 5027283 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.24374 Yes None Windows Server 2012 (Server Core installation) 5028232 (Monthly Rollup) 5028233 (Security Only) Important Remote Code Execution 5027283 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.24374 Yes None Windows Server 2012 R2 5028228 (Monthly Rollup) 5028223 (Security Only) Important Remote Code Execution 5027271 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.21063 6.3.9600.21075 Yes None Windows Server 2012 R2 (Server Core installation) 5028228 (Monthly Rollup) 5028223 (Security Only) Important Remote Code Execution 5027271 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.21063 6.3.9600.21075 Yes None Windows Server 2016	`5028169 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2016 (Server Core installation)	`5028169 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019	`5028168 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`5028168 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2022	`5028171 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2022 (Server Core installation)	`5028171 (Security Update)`	Important	Remote Code Execution	Yes

Patches

3 patches

Article	Type	Restart
`5028169`	Security Update	Yes
`5028168`	Security Update	Yes
`5028171`	Security Update	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

b2ahex

References

MSRC Advisory MITRE NVD