How severe is CVE-2026-20931?

CVE-2026-20931 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-20931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20931?

CVE-2026-20931 primarily affects Microsoft Windows 10 1607. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20931?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-20931 have an EU (EUVD) identifier?

Yes. CVE-2026-20931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2123.

When was CVE-2026-20931 published?

CVE-2026-20931 was published on 2026-01-13 and last updated on 2026-06-17.

CVE-2026-20931

CVE-2026-20931 is a high-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-73.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2123
Weakness: CWE-73
Affected product: Microsoft Windows 10 1607
Published: 2026-01-13
Last modified: 2026-06-17

Description

External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.

Frequently asked questions

What is CVE-2026-20931?: External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
How severe is CVE-2026-20931?: CVE-2026-20931 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-20931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20931?: CVE-2026-20931 primarily affects Microsoft Windows 10 1607. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20931?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-20931 have an EU (EUVD) identifier?: Yes. CVE-2026-20931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2123.
When was CVE-2026-20931 published?: CVE-2026-20931 was published on 2026-01-13 and last updated on 2026-06-17.

References

Affected products (19)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Windows 10 1607

CVE-2026-47291 — Critical (CVSS 9.8): Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
CVE-2026-44815 — Critical (CVSS 9.8): Stack-based buffer overflow in Windows DHCP Client allows an unauthorized attacker to execute code over a network.
CVE-2026-33824 — Critical (CVSS 9.8): Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
CVE-2025-60724 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a…
CVE-2025-53766 — Critical (CVSS 9.8): Heap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.
CVE-2025-47981 — Critical (CVSS 9.8): Heap-based buffer overflow in Windows SPNEGO Extended Negotiation allows an unauthorized attacker to execute code over…

All CVEs affecting Microsoft Windows 10 1607 →

Other CWE-73 vulnerabilities

CVE-2025-71338 — Critical (CVSS 10.0): Flowise contains a path traversal vulnerability in the /api/v1/document-store/loader/process endpoint that allows…
CVE-2026-39907 — Critical (CVSS 10.0): Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose an unauthenticated WCF SOAP endpoint on…
CVE-2026-27211 — Critical (CVSS 10.0): Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to…
CVE-2025-71334 — Critical (CVSS 9.8): Flowise before 3.0.6 (affected versions 2.2.8 and earlier) contains an arbitrary file access vulnerability due to…
CVE-2025-71333 — Critical (CVSS 9.8): Flowise through 2.2.4 contains an unauthenticated arbitrary file upload vulnerability in the /api/v1/attachments…
CVE-2026-39006 — Critical (CVSS 9.8): An issue in SNMP4J-Agent 3.8.3 allows a remote attacker to execute arbitrary code via the snmp4jCfgStoragePath…

Browse all CWE-73 vulnerabilities →