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Vulnerabilities

Vulnerability · CVE-2026-83855

Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

Published Oct 13, 2026 · catalog updated Oct 21, 2026 · windows 11 23h2

Check if you run it

No confirmed exploitation is on record for CVE-2026-83855. EPSS is 1.17%. Act only if a listed version of windows 11 23h2 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.17%
Remediation
Version ranges on file
Affected products
cpe microsoft/windows 11 23h2 · cpe microsoft/windows 11 24h2 · cpe microsoft/windows 11 25h2 · cpe microsoft/windows 11 26h1

Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 11 23h2< 10.0.22631.7652
  • cpe microsoft/windows 11 24h2< 10.0.26100.9711
  • cpe microsoft/windows 11 25h2< 10.0.26200.9711
  • cpe microsoft/windows 11 26h1< 10.0.28000.3231

How to fix CVE-2026-83855

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-83855. EPSS is 1.17%. Act only if a listed version of windows 11 23h2 is installed.

Which versions are affected?

Compare what you have installed with microsoft/windows 11 23h2 < 10.0.22631.7652; microsoft/windows 11 24h2 < 10.0.26100.9711; microsoft/windows 11 25h2 < 10.0.26200.9711; microsoft/windows 11 26h1 < 10.0.28000.3231. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-191: Integer Underflow. EPSS 1.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

    Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

  2. Oct 21, 2026 · NIST NVD

    Updated

    Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-83855

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-83855

    30-day exploitation probability 1.17%

    first.org
  • NIST NVDVulnerability recordCVE-2026-83855

    Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.