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Fencer Intel
medium 6.5

CVE-2018-20533 json

There is a NULL pointer dereference at ext/testcase.c (function testcase_str2dep_complex) in libsolvext.a in libsolv through 0.7.2 that wil…

published 7y ago modified 4mo ago also EUVD-2018-13087

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

There is a NULL pointer dereference at ext/testcase.c (function testcase_str2dep_complex) in libsolvext.a in libsolv through 0.7.2 that will cause a denial of service.

Patch / fix

  • libsolv Debian 14, Debian 13, Debian 12 0.6.36-1

debian advisories DEBIAN-CVE-2018-20533

  • libsolv Ubuntu Pro 16.04 LTS 0.6.11-1.1ubuntu0.1~esm1
  • libsolv Ubuntu Pro 18.04 LTS 0.6.30-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-20533

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

  • libsolv RHEL 7 0.6.34-4.el7
  • libsolv-demo RHEL 7 0.6.34-4.el7
  • python2-solv RHEL 7 0.6.34-4.el7
  • libsolv-tools RHEL 7 0.6.34-4.el7

red hat advisories RHSA-2019:2290

  • libsolv SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 0.6.36-2.30.1
  • libsolv SLE Module for Package Hub 15 SP1, SLE Module for Development Tools 15 SP1, SLE Module for Basesystem 15 SP1 0.7.6-3.7.2
  • PackageKit SLE Workstation Extension 15 SP1, SLE Module for Desktop Applications 15 SP1 1.1.10-12.3.5
  • zypper SLE Module for Basesystem 15 SP1 1.14.30-3.7.2
  • libzypp SLE Module for Basesystem 15 SP1 17.15.0-3.9.1
  • libyui-qt-pkg SLE Module for Desktop Applications 15 SP1, SLE Module for Basesystem 15 SP1 2.45.27-3.3.5
  • libyui-ncurses-pkg SLE Module for Basesystem 15 SP1 2.48.9-7.3.5
  • yast2-pkg-bindings SLE Module for Basesystem 15 SP1 4.1.2-3.3.5

suse advisories SUSE-SU-2020:2660-1SUSE-RU-2019:2742-1SUSE-SU-2019:2265-1SUSE-SU-2019:2030-1SUSE-SU-2019:1972-1

  • libsolv openSUSE Leap 15.0 0.7.5-lp150.7.1
  • libzypp openSUSE Leap 15.0 17.12.0-lp150.2.13.1
  • zypper openSUSE Leap 15.0 1.14.28-lp150.2.13.1
  • PackageKit openSUSE Leap 15.0 1.1.10-lp150.11.1
  • libyui-qt-pkg openSUSE Leap 15.0 2.45.15.2-lp150.7.1
  • libyui-ncurses-pkg openSUSE Leap 15.0 2.48.5.2-lp150.7.1
  • yast2-pkg-bindings openSUSE Leap 15.0 4.0.13-lp150.2.13.1

opensuse advisories openSUSE-SU-2019:1927-1

Is CVE-2018-20533 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2018-20533 updated cvss 3.3

libsolv: NULL pointer dereference in function testcase_str2dep_complex

  • Red Hat Enterprise Linux Client (v. 7) libsolv 0.6.34-4.el7 Red Hat Enterprise Linux Client Optional (v. 7) libsolv-demo 0.6.34-4.el7, python2-solv 0.6.34-4.el7, libsolv-tools 0.6.34-4.el7 Red Hat Enterprise Linux ComputeNode (v. 7) libsolv 0.6.34-4.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libsolv-demo 0.6.34-4.el7, python2-solv 0.6.34-4.el7, libsolv-tools 0.6.34-4.el7 Red Hat Enterprise Linux Server (v. 7) libsolv 0.6.34-4.el7 Red Hat Enterprise Linux Server Optional (v. 7) libsolv-demo 0.6.34-4.el7, python2-solv 0.6.34-4.el7, libsolv-tools 0.6.34-4.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) libsolv 0.6.34-4.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) libsolv-demo 0.6.34-4.el7, python2-solv 0.6.34-4.el7, libsolv-tools 0.6.34-4.el7
    fixed: vendor fix RHSA-2019:2290
  • Red Hat Enterprise Linux 8 libsolv, python3-solv, libsolv-tools
    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

Exploit prediction

2.08% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1652599 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

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.