How severe is CVE-2020-15802?

CVE-2020-15802 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-15802 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15802?

CVE-2020-15802 affects Bluetooth Bluetooth Core Specification. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15802?

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

When was CVE-2020-15802 published?

CVE-2020-15802 was published on 2020-09-11 and last updated on 2026-06-17.

CVE-2020-15802

CVE-2020-15802 is a medium-severity vulnerability in Bluetooth Bluetooth Core Specification with a CVSS 3.x base score of 5.9. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Bluetooth Bluetooth Core Specification
Published: 2020-09-11
Last modified: 2026-06-17

Description

Devices supporting Bluetooth before 5.1 may allow man-in-the-middle attacks, aka BLURtooth. Cross Transport Key Derivation in Bluetooth Core Specification v4.2 and v5.0 may permit an unauthenticated user to establish a bonding with one transport, either LE or BR/EDR, and replace a bonding already established on the opposing transport, BR/EDR or LE, potentially overwriting an authenticated key with an unauthenticated key, or a key with greater entropy with one with less.

Frequently asked questions

What is CVE-2020-15802?: Devices supporting Bluetooth before 5.1 may allow man-in-the-middle attacks, aka BLURtooth. Cross Transport Key Derivation in Bluetooth Core Specification v4.2 and v5.0 may permit an unauthenticated user to establish a bonding with one transport, either LE or BR/EDR, and replace a bonding already established on the opposing transport, BR/EDR or LE, potentially overwriting an authenticated key with an unauthenticated key, or a key with greater entropy with one with less.
How severe is CVE-2020-15802?: CVE-2020-15802 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-15802 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15802?: CVE-2020-15802 affects Bluetooth Bluetooth Core Specification. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15802?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15802 published?: CVE-2020-15802 was published on 2020-09-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bluetooth:bluetooth_core_specification:*:*:*:*:*:*:*:*

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