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Fencer Vulns
high 7.8

CVE-2020-35512 json

A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older bra…

published 2021-02-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23179

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors

Patch / fix

  • dbus Debian 14, Debian 13, Debian 12 1.12.20-1

debian advisories DEBIAN-CVE-2020-35512

  • dbus Ubuntu 18.04 LTS 1.12.2-1ubuntu1.3
  • dbus Ubuntu 20.04 LTS 1.12.16-2ubuntu2.2
  • dbus Ubuntu Pro 16.04 LTS 1.10.6-1ubuntu3.6+esm1

ubuntu advisories UBUNTU-CVE-2020-35512

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

  • dbus-1 SLES 12 SP2-BCL 1.8.22-24.22.1
  • dbus-1-x11 SLES 12 SP2-BCL 1.8.22-24.22.1
  • dbus-1 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +7 more 1.8.22-29.21.1
  • dbus-1-x11 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +7 more 1.8.22-29.21.1
  • dbus-1 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.8.22-35.2
  • dbus-1-x11 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.8.22-35.2
  • dbus-1 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +9 more 1.12.2-8.6.1
  • dbus-1-x11 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +8 more 1.12.2-8.6.1

suse advisories SUSE-SU-2022:2788-1SUSE-SU-2021:2590-1SUSE-SU-2021:2424-1SUSE-SU-2021:2292-1SUSE-SU-2021:2211-1

  • dbus-1 openSUSE Leap 15.2 1.12.2-lp152.6.3.1
  • dbus-1-x11 openSUSE Leap 15.2 1.12.2-lp152.6.3.1
  • dbus-1 openSUSE Leap 15.3 1.12.2-8.6.1
  • dbus-1-x11 openSUSE Leap 15.3 1.12.2-8.6.1

opensuse advisories openSUSE-SU-2021:1056-1openSUSE-SU-2021:2292-1

  • dbus Arch Linux 1.12.20-1

arch linux advisories AVG-1573

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-2020-35512 updated cvss 7.0

dbus: users with the same numeric UID could lead to use-after-free and undefined behaviour

  • Red Hat Enterprise Linux 5 dbus Red Hat Enterprise Linux 6 dbus, dbus-x11, dbus-libs Red Hat Enterprise Linux 7 dbus, dbus-x11, dbus-libs, dbus-tests
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 dbus, dbus-x11, dbus-libs, dbus-tools, dbus-common, dbus-daemon
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 dbus, dbus-x11, dbus-libs, dbus-tools, dbus-common, dbus-daemon
    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 SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
23 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • n/a D-Bus Development branch
  • n/a dbus-1.12.x stable branch
  • n/a dbus-1.10.x and older branches (EOL)

Classification

Weakness

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.