How severe is CVE-2025-53477?

CVE-2025-53477 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-53477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-53477?

CVE-2025-53477 affects Apache Nimble. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-53477?

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-2025-53477 have an EU (EUVD) identifier?

Yes. CVE-2025-53477 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1853.

When was CVE-2025-53477 published?

CVE-2025-53477 was published on 2026-01-10 and last updated on 2026-06-17.

CVE-2025-53477

CVE-2025-53477 is a high-severity vulnerability in Apache Nimble with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1853
Weakness: CWE-476
Affected product: Apache Nimble
Published: 2026-01-10
Last modified: 2026-06-17

Description

NULL Pointer Dereference vulnerability in Apache Nimble. Missing validation of HCI connection complete or HCI command TX buffer could lead to NULL pointer dereference. This issue requires disabled asserts and broken or bogus Bluetooth controller and thus severity is considered low. This issue affects Apache NimBLE: through 1.8.0. Users are recommended to upgrade to version 1.9.0, which fixes the issue.

Frequently asked questions

What is CVE-2025-53477?: NULL Pointer Dereference vulnerability in Apache Nimble. Missing validation of HCI connection complete or HCI command TX buffer could lead to NULL pointer dereference. This issue requires disabled asserts and broken or bogus Bluetooth controller and thus severity is considered low. This issue affects Apache NimBLE: through 1.8.0. Users are recommended to upgrade to version 1.9.0, which fixes the issue.
How severe is CVE-2025-53477?: CVE-2025-53477 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-53477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-53477?: CVE-2025-53477 affects Apache Nimble. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-53477?: 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-2025-53477 have an EU (EUVD) identifier?: Yes. CVE-2025-53477 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1853.
When was CVE-2025-53477 published?: CVE-2025-53477 was published on 2026-01-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:nimble:*:*:*:*:*:*:*:*

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