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CVE-2018-20534

22
FAUCET Score

CVE-2018-20534 describes an illegal address access vulnerability in libsolv.a, specifically within the ext/testcase.c file of libsolv versions up to 0.7.2, potentially leading to a denial of service. While it affects products like Canonical libsolv and openSUSE libsolv, third parties dispute its real-world impact, claiming it only affects the test suite. The vulnerability has a CVSSv3 score of 6.5 (Medium), indicating a network-based attack with low complexity and high availability impact, but requires user interaction. There is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.7.2CPE matchmatch criteria
cpe:2.3:a:opensuse:libsolv:*:*:*:*:*:*:*:*
18.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.33%
Probability of exploitation in next 30 days
EPSS Percentile
81.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0233 is in the 91st percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (11)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libsolv-0:0.6.34-4.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: createrepo_c-0:0.11.0-3.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: dnf-0:4.2.7-6.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: dnf-plugins-core-0:4.0.8-3.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libcomps-0:0.1.11-2.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libdnf-0:0.35.1-8.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: librepo-0:1.10.3-3.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: librhsm-0:0.0.3-3.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libsolv-0:0.7.4-3.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: microdnf-0:3.0.1-3.el8
View patch

Vendor Advisories (1)

redhatCVE-2018-20534Low

libsolv: illegal address access in pool_whatprovides in src/pool.h

Nov 22, 2018

References

lists.opensuse.org / opensuse-security-announce/2019-08/msg00057.html
access.redhat.com / errata/RHSA-2019:2290
access.redhat.com / errata/RHSA-2019:3583
bugzilla.redhat.com / show_bug.cgi
ExploitIssue TrackingThird Party Advisory
bugzilla.suse.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / openSUSE/libsolv/pull/291
PatchThird Party Advisory
usn.ubuntu.com / 3916-1
Third Party Advisory