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NVD / CVE Program· CNA microsoft

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

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.38% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Windows Server 2008 R2 for x64-based Systems Service Pack 1 6.1.7601.26623; Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 6.1.7601.26623; Windows Server 2012 6.2.9200.24374.

Low priority for now. Upgrade to Windows Server 2008 R2 for x64-based Systems Service Pack 1 6.1.7601.26623; Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 6.1.7601.26623; Windows Server 2012 6.2.9200.24374 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Published
Jul 11, 2023
Updated
Jun 17, 2026
EPSS
0.3% · 32th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-33163

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

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  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
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Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftwindows server 2008
microsoftwindows server 2012
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows server 2022

Using windows server 2008? Add it to your stack and be the first to know about CVEs like this one. (Windows Server, Active Directory)

Watch new CVEs for windows server 2008

When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or is weaponized

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every Monday

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows Server 2008 R2 Service Pack 1

    • 6.1.7601.0 and later · before 6.1.7601.26623affected

  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)

    • 6.1.7601.0 and later · before 6.1.7601.26623affected

  • Microsoft Windows Server 2012

    • 6.2.9200.0 and later · before 6.2.9200.24374affected

  • Microsoft Windows Server 2012 (Server Core installation)

    • 6.2.9200.0 and later · before 6.2.9200.24374affected

  • Microsoft Windows Server 2012 R2

    • 6.3.9600.0 and later · before 6.3.9600.21063affected

  • Microsoft Windows Server 2012 R2 (Server Core installation)

    • 6.3.9600.0 and later · before 6.3.9600.21063affected

  • Microsoft Windows Server 2016

    • 10.0.14393.0 and later · before 10.0.14393.6085affected

  • Microsoft Windows Server 2016 (Server Core installation)

    • 10.0.14393.0 and later · before 10.0.14393.6085affected

  • Microsoft Windows Server 2019

    • 10.0.17763.0 and later · before 10.0.17763.4645affected

  • Microsoft Windows Server 2019 (Server Core installation)

    • 10.0.17763.0 and later · before 10.0.17763.4645affected

  • Microsoft Windows Server 2022

    • 10.0.20348.0 and later · before 10.0.20348.1850affected
Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2008r2
  • microsoft windows server 2012all versions
  • microsoft windows server 2012r2
  • microsoft windows server 2016all versions
  • microsoft windows server 2019all versions
  • microsoft windows server 2022all versions

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-1350A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows…KEV
    99Now
  • CVE-2020-1040A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an…KEV
    68This week
  • CVE-2009-3103Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold…
    68This week

Published before and after this one in the same product

  • ← EarlierCVE-2023-32033Jul 11, 2023 · Microsoft Failover Cluster Remote Code Execution Vulnerability
    28Monitor
  • ← EarlierCVE-2023-32050Jul 11, 2023 · Windows Installer Elevation of Privilege Vulnerability
    28Monitor
  • Later →CVE-2023-35310Jul 11, 2023 · Windows DNS Server Remote Code Execution Vulnerability
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Windows Server 2008 R2 for x64-based Systems Service Pack 16.1.7601.26623 · KB5028240Microsoft (MSRC)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)6.1.7601.26623 · KB5028240Microsoft (MSRC)
Windows Server 20126.2.9200.24374 · KB5028232Microsoft (MSRC)
Windows Server 2012 (Server Core installation)6.2.9200.24374 · KB5028232Microsoft (MSRC)
Windows Server 2012 R26.3.9600.21063 · KB5028228Microsoft (MSRC)
Windows Server 2012 R26.3.9600.21075 · KB5028223Microsoft (MSRC)
Windows Server 2012 R2 (Server Core installation)6.3.9600.21063 · KB5028228Microsoft (MSRC)
Windows Server 2012 R2 (Server Core installation)6.3.9600.21075 · KB5028223Microsoft (MSRC)
Windows Server 201610.0.14393.6085 · KB5028169Microsoft (MSRC)
Windows Server 2016 (Server Core installation)10.0.14393.6085 · KB5028169Microsoft (MSRC)
Windows Server 201910.0.17763.4645 · KB5028168Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.4645 · KB5028168Microsoft (MSRC)
Windows Server 202210.0.20348.1850 · KB5028171Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.1850 · KB5028171Microsoft (MSRC)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-591 · Sensitive Data Storage in Improperly Locked Memory

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records