What is CVE-2026-49177?
Out-of-bounds read in Windows TCP/IP allows an authorized attacker to disclose information locally.
The record classifies CVE-2026-49177 under weakness class CWE-125. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 88 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 5.5 — MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - EPSS (FIRST)
- 0.4% probability of exploitation in the next 30 days, higher than 36.5% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-07-14, last modified 2026-10-08
Is CVE-2026-49177 being exploited?
Weaponised exploit code for CVE-2026-49177 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- Microsoft: Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016
How to fix CVE-2026-49177
The record marks a vendor fix as available for CVE-2026-49177. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49177. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49177. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-49177
1 tracked threat in the Threadlinqs corpus references CVE-2026-49177, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.