How severe is CVE-2026-21709?

CVE-2026-21709 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21709 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21709?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21709 have an EU (EUVD) identifier?

Yes. CVE-2026-21709 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23438.

When was CVE-2026-21709 published?

CVE-2026-21709 was published on 2026-04-17 and last updated on 2026-06-17.

CVE-2026-21709

CVE-2026-21709 is a medium-severity vulnerability with a CVSS 3.x base score of 6.7. 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-77.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23438
Weakness: CWE-77
Published: 2026-04-17
Last modified: 2026-06-17

Description

A vulnerability allowing a local attacker with administrator privileges to bypass Windows Driver Signature Enforcement.

Frequently asked questions

What is CVE-2026-21709?: A vulnerability allowing a local attacker with administrator privileges to bypass Windows Driver Signature Enforcement.
How severe is CVE-2026-21709?: CVE-2026-21709 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-21709 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21709?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21709 have an EU (EUVD) identifier?: Yes. CVE-2026-21709 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23438.
When was CVE-2026-21709 published?: CVE-2026-21709 was published on 2026-04-17 and last updated on 2026-06-17.

References

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