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Vulnerabilities

Vulnerability · CVE-2025-59497

Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.

Published Oct 14, 2025 · catalog updated Feb 22, 2026 · Microsoft Microsoft Defender for Endpoint for Linux

Check if you run it

No confirmed exploitation is on record for CVE-2025-59497. EPSS is 0.21%. Act only if a listed version of Microsoft Microsoft Defender for Endpoint for Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Version ranges on file
Affected products
vendor Microsoft Microsoft Defender for Endpoint for Linux 101.0.0 <101.25032.0010

Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.

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.

  • vendor Microsoft Microsoft Defender for Endpoint for Linux 101.0.0 <101.25032.0010101.0.0 <101.25032.0010

How to fix CVE-2025-59497

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-2025-59497. EPSS is 0.21%. Act only if a listed version of Microsoft Microsoft Defender for Endpoint for Linux is installed.

Which versions are affected?

Compare what you have installed with Microsoft Microsoft Defender for Endpoint for Linux 101.0.0 <101.25032.0010 101.0.0 <101.25032.0010. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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 14, 2025 · EUVD

    Detected

    Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.

  2. Feb 22, 2026 · EUVD

    Updated

    Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.

Sources

  • CVE.orgVulnerability recordCVE-2025-59497

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59497

    30-day exploitation probability 0.21%

    first.org
  • EUVDVulnerability recordEUVD-2025-34266

    Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.

    euvd.enisa.europa.eu

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.