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Fencer Vulns
high 7.8

CVE-2020-1712 json

A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while han…

published 2020-03-31 6 y ago modified 2026-10-14 26 d ago also EUVD-2020-12567

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted dbus messages.

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • systemd Debian 14, Debian 13, Debian 12 244.2-1

debian advisories DEBIAN-CVE-2020-1712

  • systemd Ubuntu 16.04 LTS 229-4ubuntu21.27
  • systemd Ubuntu 18.04 LTS 237-3ubuntu10.38
  • systemd Ubuntu 20.04 LTS 244.1-0ubuntu3

ubuntu advisories UBUNTU-CVE-2020-1712

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

  • systemd RHEL 8 239-18.el8_1.4
  • systemd-pam RHEL 8 239-18.el8_1.4
  • systemd-libs RHEL 8 239-18.el8_1.4
  • systemd-udev RHEL 8 239-18.el8_1.4
  • systemd-tests RHEL 8 239-18.el8_1.4
  • systemd-container RHEL 8 239-18.el8_1.4
  • systemd-journal-remote RHEL 8 239-18.el8_1.4
  • systemd RHEL 8.0 E4S 239-13.el8_0.7

red hat advisories RHSA-2020:0575RHSA-2020:0564

  • systemd SLE Module for Basesystem 15 SP1 234-24.46.1
  • systemd SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +12 more 228-150.82.1
  • systemd SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 228-157.9.1
  • systemd SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP1 +3 more 234-24.39.1

suse advisories SUSE-RU-2020:0793-1SUSE-SU-2020:0331-1SUSE-SU-2020:0353-1SUSE-SU-2020:0335-1

  • systemd openSUSE Tumbleweed 249.4-2.2
  • systemd openSUSE Leap 15.1 234-lp151.26.7.1
  • systemd-mini openSUSE Leap 15.1 234-lp151.26.7.1

opensuse advisories openSUSE-SU-2024:11420-1openSUSE-SU-2020:0208-1

  • systemd Arch Linux 244.2-1

arch linux advisories AVG-1094

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-2020-1712 updated cvss 7.8

systemd: use-after-free when asynchronous polkit queries are performed

  • Red Hat Enterprise Linux BaseOS (v. 8) systemd 239-18.el8_1.4, systemd-pam 239-18.el8_1.4, systemd-libs 239-18.el8_1.4, systemd-udev 239-18.el8_1.4, systemd-tests 239-18.el8_1.4, systemd-container 239-18.el8_1.4, +1 more
    fixed: vendor fix RHSA-2020:0575
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.0) systemd 239-13.el8_0.7, systemd-pam 239-13.el8_0.7, systemd-libs 239-13.el8_0.7, systemd-udev 239-13.el8_0.7, systemd-tests 239-13.el8_0.7, systemd-container 239-13.el8_0.7, +1 more
    fixed: vendor fix RHSA-2020:0564
  • Red Hat Enterprise Linux 7 systemd, libgudev1, systemd-libs, systemd-sysv, systemd-python, systemd-networkd, +2 more Red Hat Enterprise Linux 9 systemd, systemd-pam, systemd-libs, systemd-oomd, systemd-udev, systemd-ukify, +6 more Red Hat OpenShift Container Platform 4 systemd, systemd-pam, systemd-libs, systemd-oomd, systemd-udev, systemd-tests, +7 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-23-348-10 updated cvss 7.8

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
17 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • [UNKNOWN] systemd
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

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.