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Fencer Vulns
medium 6.0

CVE-2020-10759 json

A PGP signature bypass flaw was found in fwupd (all versions), which could lead to the installation of unsigned firmware.

published 2020-09-15 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3175

cvss
6.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

A PGP signature bypass flaw was found in fwupd (all versions), which could lead to the installation of unsigned firmware. As per upstream, a signature bypass is theoretically possible, but not practical because the Linux Vendor Firmware Service (LVFS) is either not implemented or enabled in versions of fwupd shipped with Red Hat Enterprise Linux 7 and 8. The highest threat from this vulnerability is to confidentiality and integrity.

Patch / fix

  • fwupd Debian 14, Debian 13, Debian 12 1.3.10-1
  • libjcat Debian 14, Debian 13, Debian 12 0.1.3-1

debian advisories DEBIAN-CVE-2020-10759

  • fwupd Ubuntu 16.04 LTS 0.8.3-0ubuntu5.1
  • fwupd Ubuntu 18.04 LTS 1.2.10-1ubuntu2~ubuntu18.04.5
  • fwupd Ubuntu 20.04 LTS 1.3.9-4ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-10759

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

  • fwupd RHEL 8 1.4.2-4.el8
  • gnome-software RHEL 8 3.36.1-4.el8
  • libxmlb RHEL 8 0.1.15-1.el8
  • appstream-data RHEL 8 8-20200724.el8

red hat advisories RHSA-2020:4436

  • fwupd SLE Module for Desktop Applications 15 SP2 1.2.14-5.8.2
  • fwupd SLE Module for Desktop Applications 15 SP1 1.0.9-6.3.1

suse advisories SUSE-SU-2021:1107-1SUSE-SU-2020:1681-1

  • fwupd openSUSE Tumbleweed 1.5.8-1.5
  • fwupd openSUSE Leap 15.2 1.2.14-lp152.3.9.1
  • fwupd openSUSE Leap 15.1 1.0.9-lp151.2.3.1

opensuse advisories openSUSE-SU-2024:10774-1openSUSE-SU-2021:0522-1openSUSE-SU-2020:0849-1

  • libxmlb AlmaLinux 8 0.1.15-1.el8
  • appstream-data AlmaLinux 8 8-20200724.el8

almalinux advisories ALSA-2020:4436

  • libxmlb Rocky Linux 8 0.1.15-1.el8
  • appstream-data Rocky Linux 8 8-20200724.el8

rocky linux advisories RLSA-2020:4436

  • libjcat Arch Linux 0.1.3-1
  • fwupd Arch Linux 1.4.0-1

arch linux advisories AVG-1185AVG-1186

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-2020-10759 updated cvss 5.7

fwupd: Possible bypass in signature verification

  • Red Hat Enterprise Linux 7 fwupd
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) gnome-software 3.36.1-4.el8, appstream-data 8-20200724.el8 Red Hat Enterprise Linux BaseOS (v. 8) fwupd 1.4.2-4.el8, libxmlb 0.1.15-1.el8
    fixed: vendor fix RHSA-2020:4436

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

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/justinsteven/advisories/blob/master/2020_fwupd_dangling_s3_bucket_and_CVE-2020-10759_signature_verification_bypass.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 3.3 AV:L/AC:M/Au:N/C:P/I:P/A:N

Affected products

  • n/a fwupd

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns 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.