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NVD / CVE Program· CNA microsoft

CVE-2026-62878: Windows DNS Server Remote Code Execution Vulnerability

Noroxi assessment

Priority: Monitor (action score 39/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.97% (FIRST EPSS); higher than 62% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Windows Server 2012 6.2.9200.26280; Windows Server 2012 (Server Core installation) 6.2.9200.26280; Windows Server 2012 R2 6.3.9600.23338.

Low priority for now. Upgrade to Windows Server 2012 6.2.9200.26280; Windows Server 2012 (Server Core installation) 6.2.9200.26280; Windows Server 2012 R2 6.3.9600.23338 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

Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available
Published
Aug 11, 2026
Updated
Oct 30, 2026
EPSS
0.9% · 62th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
9.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/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
  • Proof of concept exists, no weaponized module
  • A fix has been released

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

Follow CVE-2026-62878

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

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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 10 1607
microsoftwindows 10 1809
microsoftwindows server 2012
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows server 2022
microsoftwindows server 2025

Affected versions

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

  • microsoft windows server 2012all versions
  • microsoft windows server 2012r2
  • microsoft windows server 2016before 10.0.14393.9418
  • microsoft windows server 2019before 10.0.17763.9121
  • microsoft windows server 2022before 10.0.20348.5440
  • microsoft windows server 2025before 10.0.26100.33222

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 2012

    • 6.2.9200.0 and later · before 6.2.9200.26280affected

  • Microsoft Windows Server 2012 (Server Core installation)

    • 6.2.9200.0 and later · before 6.2.9200.26280affected

  • Microsoft Windows Server 2012 R2

    • 6.3.9600.0 and later · before 6.3.9600.23338affected

  • Microsoft Windows Server 2012 R2 (Server Core installation)

    • 6.3.9600.0 and later · before 6.3.9600.23338affected

  • Microsoft Windows Server 2016

    • 10.0.14393.0 and later · before 10.0.14393.9418affected

  • Microsoft Windows Server 2016 (Server Core installation)

    • 10.0.14393.0 and later · before 10.0.14393.9418affected

  • Microsoft Windows Server 2019

    • 10.0.17763.0 and later · before 10.0.17763.9121affected

  • Microsoft Windows Server 2019 (Server Core installation)

    • 10.0.17763.0 and later · before 10.0.17763.9121affected

  • Microsoft Windows Server 2022

    • 10.0.20348.0 and later · before 10.0.20348.5499affected

  • Microsoft Windows Server 2025

    • 10.0.26100.0 and later · before 10.0.26100.33296affected

  • Microsoft Windows Server 2025 (Server Core installation)

    • 10.0.26100.0 and later · before 10.0.26100.33296affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-33824Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution VulnerabilityKEV
    92Now
  • CVE-2018-8174A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka "Windows VBScript Engine RemKEV
    86Now
  • CVE-2026-21510Windows Shell Security Feature Bypass VulnerabilityKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-62823Aug 11, 2026 · Windows DHCP Server Remote Code Execution Vulnerability
    35Monitor
  • ← EarlierCVE-2026-62876Aug 11, 2026 · Windows Win32k Elevation of Privilege Vulnerability
    31Monitor
  • Later →CVE-2026-62880Aug 11, 2026 · Windows NTFS Elevation of Privilege Vulnerability
    31Monitor

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 20126.2.9200.26280 · KB5120386Microsoft (MSRC)
Windows Server 2012 (Server Core installation)6.2.9200.26280 · KB5120386Microsoft (MSRC)
Windows Server 2012 R26.3.9600.23338 · KB5120385Microsoft (MSRC)
Windows Server 2012 R2 (Server Core installation)6.3.9600.23338 · KB5120385Microsoft (MSRC)
Windows Server 201610.0.14393.9418 · KB5120418Microsoft (MSRC)
Windows Server 2016 (Server Core installation)10.0.14393.9418 · KB5120418Microsoft (MSRC)
Windows Server 201910.0.17763.9121 · KB5120238Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.9121 · KB5120238Microsoft (MSRC)
Windows Server 202210.0.20348.5440 · KB5120229Microsoft (MSRC)
Windows Server 202210.0.20348.5499 · KB5120242Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5440 · KB5120229Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5499 · KB5120242Microsoft (MSRC)
Windows Server 202510.0.26100.33222 · KB5120228Microsoft (MSRC)
Windows Server 202510.0.26100.33296 · KB5120233Microsoft (MSRC)
Windows Server 2025 (Server Core installation)10.0.26100.33222 · KB5120228Microsoft (MSRC)
Windows Server 2025 (Server Core installation)10.0.26100.33296 · KB5120233Microsoft (MSRC)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:12026-09-24

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.

  1. Published
  2. First PoC+43 d
  3. TodayNov 1, 2026+82 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-6991028 days apartWindows Hyper-V Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-7298228 days apartWindows Netlogon Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-4481563 days apartDHCP Client Service Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-8580663 days apartNetwork Policy Server (NPS) Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-628240 days apartRemote Desktop Client Remote Code Execution Vulnerability
    35Monitor
  • CVE-2026-6971428 days apartWindows Device Association Service Elevation of Privilege Vulnerability
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:N/AC:L/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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

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

All records