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Fencer Intel
medium 4.2

CVE-2020-26558 json

Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 through 5.2 may permit a nearby man-in-the-middle attacker to id…

published 2021-05-24 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19103

cvss
4.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 through 5.2 may permit a nearby man-in-the-middle attacker to identify the Passkey used during pairing (in the Passkey authentication procedure) by reflection of the public key and the authentication evidence of the initiating device, potentially permitting this attacker to complete authenticated pairing with the responding device using the correct Passkey for the pairing session. The attack methodology determines the Passkey value one bit at a time.

Patch / fix

  • linux linux_kernel 5.13
  • bluez Debian 14, Debian 13, Debian 12 5.55-3.1
  • linux Debian 14, Debian 13, Debian 12 5.10.40-1

debian advisories DEBIAN-CVE-2020-26558

  • bluez Ubuntu 18.04 LTS 5.48-0ubuntu3.5
  • bluez Ubuntu 20.04 LTS 5.53-0ubuntu3.2
  • linux Ubuntu 18.04 LTS 4.15.0-151.157
  • linux Ubuntu 20.04 LTS 5.4.0-80.90
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1109.116
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1054.57
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1049.53
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1049.52

ubuntu advisories UBUNTU-CVE-2020-26558

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bluez RHEL 8 5.56-1.el8
  • bluez-cups RHEL 8 5.56-1.el8
  • bluez-libs RHEL 8 5.56-1.el8
  • bluez-obexd RHEL 8 5.56-1.el8
  • bluez-hid2hci RHEL 8 5.56-1.el8

red hat advisories RHSA-2021:4432

  • kernel-64kb SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, Enterprise Storage 7.1 5.3.18-150300.59.170.1
  • kernel-syms SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.170.1
  • kernel-source SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.170.1
  • kernel-default SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +5 more 5.3.18-150300.59.170.1
  • kernel-preempt SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.170.1
  • kernel-obs-build SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.170.1
  • kernel-default-base SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 5.3.18-150300.59.170.1.150300.18.100.1
  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.225.1

suse advisories SUSE-SU-2024:2948-1SUSE-SU-2024:2940-1SUSE-SU-2024:2923-1SUSE-SU-2024:2901-1SUSE-SU-2022:3691-1SUSE-SU-2022:3687-1

  • kernel-default openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-vanilla openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-kvmsmall openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-zfcpdump openSUSE Leap 15.3 4.12.14-197.99.1
  • bluez openSUSE Leap 15.3 5.55-3.3.1
  • kernel-azure openSUSE Leap 15.3 5.3.18-38.8.1
  • kernel-syms-azure openSUSE Leap 15.3 5.3.18-38.8.1
  • kernel-source-azure openSUSE Leap 15.3 5.3.18-38.8.1

opensuse advisories openSUSE-SU-2021:2427-1openSUSE-SU-2021:2291-1openSUSE-SU-2021:2202-1openSUSE-SU-2021:2184-1

  • linux Arch Linux 5.12.7.arch1-1
  • bluez Arch Linux 5.57-1

arch linux advisories AVG-2049AVG-2050

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-26558 updated cvss 4.2

bluez: Passkey Entry protocol of the Bluetooth Core is vulnerable to an impersonation attack

  • Red Hat Enterprise Linux 7 bluez, bluez-cups, bluez-libs, bluez-hid2hci
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) bluez-debuginfo 5.56-1.el8, bluez-libs-devel 5.56-1.el8, bluez-debugsource 5.56-1.el8, bluez-cups-debuginfo 5.56-1.el8, bluez-libs-debuginfo 5.56-1.el8, bluez-obexd-debuginfo 5.56-1.el8, +1 more Red Hat Enterprise Linux AppStream (v. 8) bluez-cups 5.56-1.el8 Red Hat Enterprise Linux BaseOS (v. 8) bluez 5.56-1.el8, bluez-libs 5.56-1.el8, bluez-obexd 5.56-1.el8, bluez-hid2hci 5.56-1.el8
    fixed: vendor fix RHSA-2021:4432
  • Red Hat Enterprise Linux 6 perf, bluez, kernel, bluez-alsa, bluez-cups, bluez-libs, +7 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 9 rv, perf, rtla, bluez, kernel, bpftool, +87 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-074-07 updated cvss 4.2

Siemens SIMATIC

  • Siemens SIMATIC RF160B (6GT2003-0FA00) <V2.2
    affected: mitigation “Siemens has released a new version (V2.2) for SIMATIC RF160B and recommends to update to the latest version.” siemens.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 4.2 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 4.3 AV:A/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.