How severe is CVE-2026-25507?

CVE-2026-25507 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2026-25507 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25507?

CVE-2026-25507 primarily affects Espressif Esp-idf. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-25507?

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

Does CVE-2026-25507 have an EU (EUVD) identifier?

Yes. CVE-2026-25507 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5377.

When was CVE-2026-25507 published?

CVE-2026-25507 was published on 2026-02-04 and last updated on 2026-06-17.

CVE-2026-25507

CVE-2026-25507 is a medium-severity vulnerability in Espressif Esp-idf with a CVSS 3.x base score of 6.3. 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-416.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5377
Weakness: CWE-416
Affected product: Espressif Esp-idf
Published: 2026-02-04
Last modified: 2026-06-17

Description

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a use-after-free vulnerability was reported in the BLE provisioning transport (protocomm_ble) layer. The issue can be triggered by a remote BLE client while the device is in provisioning mode. The vulnerability occurred when provisioning was stopped with keep_ble_on = true. In this configuration, internal protocomm_ble state and GATT metadata were freed while the BLE stack and GATT services remained active. Subsequent BLE read or write callbacks dereferenced freed memory, allowing a connected or newly connected client to trigger invalid memory acces. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.

Frequently asked questions

What is CVE-2026-25507?: ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a use-after-free vulnerability was reported in the BLE provisioning transport (protocomm_ble) layer. The issue can be triggered by a remote BLE client while the device is in provisioning mode. The vulnerability occurred when provisioning was stopped with keep_ble_on = true. In this configuration, internal protocomm_ble state and GATT metadata were freed while the BLE stack and GATT services remained active. Subsequent BLE read or write callbacks dereferenced freed memory, allowing a connected or newly connected client to trigger invalid memory acces. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.
How severe is CVE-2026-25507?: CVE-2026-25507 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2026-25507 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25507?: CVE-2026-25507 primarily affects Espressif Esp-idf. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-25507?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25507 have an EU (EUVD) identifier?: Yes. CVE-2026-25507 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5377.
When was CVE-2026-25507 published?: CVE-2026-25507 was published on 2026-02-04 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:espressif:esp-idf:5.1.6:*:*:*:*:*:*:*
cpe:2.3:a:espressif:esp-idf:5.2.6:*:*:*:*:*:*:*
cpe:2.3:a:espressif:esp-idf:5.3.4:*:*:*:*:*:*:*
cpe:2.3:a:espressif:esp-idf:5.4.3:*:*:*:*:*:*:*
cpe:2.3:a:espressif:esp-idf:5.5.2:*:*:*:*:*:*:*

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