CVE-2019-1338
published 2019-10-10CVE-2019-1338: A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a…
PriorityP431medium5.9CVSS 3.1
AVNACHPRNUINSUCNIHAN
EPSS
3.32%
87.2th percentile
A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses, aka 'Windows NTLM Security Feature Bypass Vulnerability'.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows | — | — |
| microsoft | windows | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server | — | — |
| microsoft | windows_server_2008 | — | — |
| msrc | windows_7_for_32-bit_systems_service_pack_1 | — | — |
| msrc | windows_7_for_x64-based_systems_service_pack_1 | — | — |
| msrc | windows_server_2008_for_32-bit_systems_service_pack_2 | — | — |
| msrc | windows_server_2008_for_itanium-based_systems_service_pack_2 | — | — |
| msrc | windows_server_2008_for_x64-based_systems_service_pack_2 | — | — |
| msrc | windows_server_2008_r2_for_itanium-based_systems_service_pack_1 | — | — |
| msrc | windows_server_2008_r2_for_x64-based_systems_service_pack_1 | — | — |
CVSS provenance
nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
vendor_msrc5.3MEDIUM
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Microsoft
Windows NTLM Security Feature Bypass Vulnerability
vendor_msrc·2019-10-08·CVSS 5.3
CVE-2019-1338 [MEDIUM] Windows NTLM Security Feature Bypass Vulnerability
Windows NTLM Security Feature Bypass Vulnerability
Description: A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses. An attacker who successfully exploited this vulnerability could gain the ability to downgrade NTLM security features.
To exploit this vulnerability, the attacker would need to be able to modify NTLM traffic exchange.
The update addresses the vulnerability by hardening NTLMv2 protection on the server-side.
Microsoft Windows: Microsoft Windows
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Security Feature Bypass
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:N/A;Older Software Release:Ex
GHSA
GHSA-qm7q-vxj7-9xg3: A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protec
ghsa_unreviewed·2022-05-24
CVE-2019-1338 [MEDIUM] CWE-326 GHSA-qm7q-vxj7-9xg3: A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protec
A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses, aka 'Windows NTLM Security Feature Bypass Vulnerability'.
No detection rules found.
No public exploits indexed.
Trendmicro
Short October Patch Tuesday: 9 Critical Fixes Featured
blogs_trendmicro·2019-10-09·CVSS 8.8
[HIGH] Short October Patch Tuesday: 9 Critical Fixes Featured
Exploits & Vulnerabilities
# Short October Patch Tuesday: 9 Critical Fixes Featured
This month's update includes only 59 fixes, but addresses significant issues. The nine Critical items were for various IE and Edge flaws, and one for a Remote Desktop Client gap. The rest of the 50 were ranked important, including server concerns.
By: Trend Micro
2019/10/09
Read time: ( words)
Save to Folio
October’s Patch Tuesday is relatively modest, with Microsoft releasing a total of 59 patches. However, this shorter list still warrants attention. Nine of the 59 were still identified as Critical, while the remaining 50 were labeled Important. Most of the critical bulletins were for various Internet Explorer and Microsoft Edge vulnerabilities, with one covering a Remote Desktop Client vulnerability
Trendmicro
Short October Patch Tuesday: 9 Critical Fixes Featured
blogs_trendmicro·2019-10-09·CVSS 8.8
[HIGH] Short October Patch Tuesday: 9 Critical Fixes Featured
# Short October Patch Tuesday: 9 Critical Fixes Featured
This month's update includes only 59 fixes, but addresses significant issues. The nine Critical items were for various IE and Edge flaws, and one for a Remote Desktop Client gap. The rest of the 50 were ranked important, including server concerns.
By: Trend Micro
Oct 09, 2019
Read time: ( words)
Save to Folio
October’s Patch Tuesday is relatively modest, with Microsoft releasing a total of 59 patches. However, this shorter list still warrants attention. Nine of the 59 were still identified as Critical, while the remaining 50 were labeled Important. Most of the critical bulletins were for various Internet Explorer and Microsoft Edge vulnerabilities, with one covering a Remote Desktop Client vulnerability. The Important bulletins
Talos
Microsoft Patch Tuesday — Oct. 2019: Vulnerability disclosures and Snort coverage
blogs_talos·2019-10-08·CVSS 6.4
[MEDIUM] Microsoft Patch Tuesday — Oct. 2019: Vulnerability disclosures and Snort coverage
By Jon Munshaw.
Microsoft released its monthly security update today, disclosing a variety of vulnerabilities in several of its products. The latest Patch Tuesday discloses 60 vulnerabilities, nine of which are considered "critical," with the rest being deemed "important."
This month’s security update covers security issues in a variety of Microsoft services and software, the Chakra Scripting Engine, the Windows operating system and the SharePoint software.
Talos also released a new set of SNORTⓇ rules that provide coverage for some of these vulnerabilities. For more, check out the Snort blog post here.
### Critical vulnerabilities Microsoft disclosed nine critical vulnerabilities this month, eight of which we will highlight below.
CVE-2019-1333 is a client-side remote execution vulne
Talos
Microsoft Patch Tuesday — Oct. 2019: Vulnerability disclosures and Snort coverage
blogs_talos·2019-10-08·CVSS 6.4
[MEDIUM] Microsoft Patch Tuesday — Oct. 2019: Vulnerability disclosures and Snort coverage
## Microsoft Patch Tuesday — Oct. 2019: Vulnerability disclosures and Snort coverage
By Jon Munshaw.
Microsoft released its monthly security update today, disclosing a variety of vulnerabilities in several of its products. The latest Patch Tuesday discloses 60 vulnerabilities, nine of which are considered "critical," with the rest being deemed "important."
This month’s security update covers security issues in a variety of Microsoft services and software, the Chakra Scripting Engine, the Windows operating system and the SharePoint software.
Talos also released a new set of SNORTⓇ rules that provide coverage for some of these vulnerabilities. For more, check out the Snort blog post here .
## Critical vulnerabilities Microsoft disclosed nine critical vulnerabilities this month, eight of
Crowdstrike
Security Advisory: Active Directory Open to More NTLM Attacks
blogs_crowdstrike·CVSS 7.5
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Crowdstrike
Security Advisory: Active Directory Open to More NTLM Attacks
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] Security Advisory: Active Directory Open to More NTLM Attacks
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand AT
2019-10-10
Published