How severe is CVE-2025-55317?

CVE-2025-55317 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-55317 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-55317?

CVE-2025-55317 affects Microsoft Autoupdate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-55317?

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-2025-55317 have an EU (EUVD) identifier?

Yes. CVE-2025-55317 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27335.

When was CVE-2025-55317 published?

CVE-2025-55317 was published on 2025-09-09 and last updated on 2026-06-17.

CVE-2025-55317

CVE-2025-55317 is a high-severity vulnerability in Microsoft Autoupdate with a CVSS 3.x base score of 7.8. 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-59.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27335
Weakness: CWE-59
Affected product: Microsoft Autoupdate
Published: 2025-09-09
Last modified: 2026-06-17

Description

Improper link resolution before file access ('link following') in Microsoft AutoUpdate (MAU) allows an authorized attacker to elevate privileges locally.

Frequently asked questions

What is CVE-2025-55317?: Improper link resolution before file access ('link following') in Microsoft AutoUpdate (MAU) allows an authorized attacker to elevate privileges locally.
How severe is CVE-2025-55317?: CVE-2025-55317 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-55317 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-55317?: CVE-2025-55317 affects Microsoft Autoupdate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-55317?: 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-2025-55317 have an EU (EUVD) identifier?: Yes. CVE-2025-55317 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27335.
When was CVE-2025-55317 published?: CVE-2025-55317 was published on 2025-09-09 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55317

Affected products (1)

cpe:2.3:a:microsoft:autoupdate:*:*:*:*:*:macos:*:*

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