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.

Published: 2020-09-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-15802 is rated Moderate Risk (58.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 55.80%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-15802

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-23 55.49% 55.80% +0.31%
2 2026-04-24 57.23% 55.49% -1.74%
3 2026-04-21 — 57.23% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-15802

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-15802

OS Trackers for CVE-2020-15802

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2020-15802
suse medium CVE-2020-15802 severity moderate: SUSE including 9 source package names (kernel-default, kernel-default-base, …), 140 product×package rows across 36 product lines (SUSE Enterprise Storage 7, SUSE Linux Enterprise High Performance Computing 12 SP5, … (36 product lines)): Will Not Fix 140. https://www.suse.com/security/cve/CVE-2020-15802/
ubuntu medium CVE-2020-15802 medium priority: Ubuntu including 168 source packages (linux, linux-allwinner, …), 2161 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1692, ignored 307, needs-triage 162. https://ubuntu.com/security/CVE-2020-15802

Affected software / configurations for CVE-2020-15802

Vendor Product Version Raw CPE
bluetooth bluetooth_core_specification < 5.1 cpe:2.3:a:bluetooth:bluetooth_core_specification:*:*:*:*:*:*:*:*

References for CVE-2020-15802

cvelogic Threat Intelligence