CVE-2026-69431: Telnet Client Remote Code Execution Vulnerability
Published Sep 8, 2026
·Updated
Heap-based buffer overflow in Telnet Client allows an unauthorized attacker to execute code over a network.
Other sources
Telnet Client Remote Code Execution Vulnerability
— Microsoft
Affected Software
54 affected componentsFixes available
Microsoft Windows Server 2016<10.0.14393.9512
10.0.14393.9512
Microsoft Windows Server 2012<6.2.9200.26349
6.2.9200.26349
Microsoft Windows Server 2016<10.0.14393.9512
10.0.14393.9512
Microsoft Windows Server 2012 R2<6.3.9600.23397
6.3.9600.23397
Microsoft Windows Server 2012<6.2.9200.26349
6.2.9200.26349
Microsoft Windows Server 2012 R2<6.3.9600.23397
6.3.9600.23397
Microsoft Windows Server 2025<10.0.26100.33438
10.0.26100.33438
Microsoft Windows Server 2025<10.0.26100.33438
10.0.26100.33438
Microsoft Windows Server 2022<10.0.20348.5622
10.0.20348.5622
Microsoft Windows Server 2019<10.0.17763.9245
10.0.17763.9245
Microsoft Windows Server 2022<10.0.20348.5622
10.0.20348.5622
Microsoft Windows Server 2019<10.0.17763.9245
10.0.17763.9245
Microsoft Windows 10 1607<10.0.14393.9512
Microsoft Windows 10 1607<10.0.14393.9512
Microsoft Windows 10 1809<10.0.17763.9245
Microsoft Windows 10 1809<10.0.17763.9245
Microsoft Windows 10 21h2<10.0.19044.7725
Microsoft Windows 10 21h2<10.0.19044.7725
Microsoft Windows 10 21h2<10.0.19044.7725
Microsoft Windows 10 22h2<10.0.19045.7725
Microsoft Windows 10 22h2<10.0.19045.7725
Microsoft Windows 10 22h2<10.0.19045.7725
Microsoft Windows 11 23h2<10.0.22631.7582
Microsoft Windows 11 23h2<10.0.22631.7582
Microsoft Windows 11 24h2<10.0.26100.9445
Microsoft Windows 11 24h2<10.0.26100.9445
Microsoft Windows 11 25h2<10.0.26200.9445
Microsoft Windows 11 25h2<10.0.26200.9445
Microsoft Windows 11 26h1<10.0.28000.2954
Microsoft Windows 11 26h1<10.0.28000.2954
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9512
Microsoft Windows Server 2019<10.0.17763.9245
Microsoft Windows Server 2022<10.0.20348.5622
Microsoft Windows Server 2025<10.0.26100.33438
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.2954
10.0.28000.2954
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9512
10.0.14393.9512
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9512
10.0.14393.9512
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.2954
10.0.28000.2954
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7582
10.0.22631.7582
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9445
10.0.26100.9445
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9445
10.0.26200.9445
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9445
10.0.26100.9445
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7582
10.0.22631.7582
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7725
10.0.19045.7725
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9445
10.0.26200.9445
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7725
10.0.19044.7725
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7725
10.0.19045.7725
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7725
10.0.19044.7725
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7725
10.0.19045.7725
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7725
10.0.19044.7725
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9245
10.0.17763.9245
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9245
10.0.17763.9245
Remediation
Event History
Sep 8, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:11 PM
Data Sourced
via MITRE·05:11 PM
DescriptionSeverity
Data Sourced
via NVD·06:19 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
Which Windows platforms are identified as affected?
The affected software list includes Microsoft Windows 10, Windows 11, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.
2
Does exploitation require authentication or user interaction?
No. The supplied CVSS vector identifies network attack access with low attack complexity, no privileges required, and no user interaction required.
3
What could successful exploitation allow?
The vulnerability is described as allowing an unauthorized attacker to execute code over a network. Its CVSS vector rates confidentiality, integrity, and availability impacts as high.
4
Is an official remediation indicated?
Yes. The supplied CVSS vector includes remediation level RL:O, which indicates an official fix. The provided data does not include specific update, KB, or build details.