CVE-2018-5383: Bluetooth implementations may not sufficiently validate elliptic curve parameters during Diffie-Hellman key exchange

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 25 Feb 2020. It cites 1 public report, the first from 25 Feb 2020.

• csk.gov.in

How likely is exploitation in the next 30 days?

0.8%

EPSS score, percentile 56.7 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

8.0 High

CVSS v3.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (6)

Which versions are affected?

Affected

• from 10.13 High Sierra to before 10.13.6
• from 11 to before 11.4
• before 2018-06-05 patch level

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

Bluetooth implementations may not sufficiently validate elliptic curve parameters during Diffie-Hellman key exchange

Bluetooth firmware or operating system software drivers in macOS versions before 10.13, High Sierra and iOS versions before 11.4, and Android versions before the 2018-06-05 patch may not sufficiently validate elliptic curve parameters used to generate public keys during a Diffie-Hellman key exchange, which may allow a remote attacker to obtain the encryption key used by the device.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

• RHSA-2019:2169 (Vendor advisory)
• USN-4094-1 (Vendor advisory)
• USN-4095-2 (Vendor advisory)
• USN-4095-1 (Vendor advisory)
• USN-4118-1 (Vendor advisory)
• USN-4351-1 (Vendor advisory)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline