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Fencer Intel
high 7.8

CVE-2020-18032 json

Buffer Overflow in Graphviz Graph Visualization Tools from commit ID f8b9e035 and earlier allows remote attackers to execute arbitrary code…

published 5y ago modified 4mo ago also EUVD-2020-9961

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

Buffer Overflow in Graphviz Graph Visualization Tools from commit ID f8b9e035 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by loading a crafted file into the "lib/common/shapes.c" component.

Patch / fix

  • graphviz graphviz 2.46.0
  • graphviz Debian 14, Debian 13, Debian 12 2.42.2-5

debian advisories DEBIAN-CVE-2020-18032

  • graphviz Ubuntu Pro 14.04 LTS 2.36.0-0ubuntu3.2+esm1
  • graphviz Ubuntu Pro 16.04 LTS 2.38.0-12ubuntu2.1+esm1
  • graphviz Ubuntu Pro 18.04 LTS 2.40.1-2ubuntu0.1~esm1
  • graphviz Ubuntu Pro 20.04 LTS 2.42.2-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-18032

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

  • graphviz RHEL 8 2.40.1-43.el8
  • graphviz-gd RHEL 8 2.40.1-43.el8
  • graphviz-python3 RHEL 8 2.40.1-43.el8

red hat advisories RHSA-2021:4256

  • graphviz SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +12 more 2.40.1-6.9.1
  • graphviz-addons SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +20 more 2.40.1-6.9.1
  • graphviz SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 2.28.0-29.6.1
  • graphviz-plugins SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +13 more 2.28.0-29.6.1

suse advisories SUSE-SU-2021:1651-1SUSE-SU-2021:1646-1

  • graphviz openSUSE Leap 15.3 2.40.1-6.9.1
  • graphviz-addons openSUSE Leap 15.3 2.40.1-6.9.1
  • graphviz openSUSE Leap 15.2 2.40.1-lp152.7.10.1
  • graphviz-addons openSUSE Leap 15.2 2.40.1-lp152.7.10.1

opensuse advisories openSUSE-SU-2021:1651-1openSUSE-SU-2021:0757-1

  • graphviz AlmaLinux 8 2.40.1-43.el8
  • graphviz-gd AlmaLinux 8 2.40.1-43.el8
  • graphviz-python3 AlmaLinux 8 2.40.1-43.el8

almalinux advisories ALSA-2021:4256

  • graphviz Rocky Linux 8 2.40.1-43.el8

rocky linux advisories RLSA-2021:4256

  • graphviz Alpine 3.11 2.42.3-r1
  • graphviz Alpine 3.12 2.44.0-r1
  • graphviz Alpine 3.13 2.44.0-r2
  • graphviz Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.46.0-r0

alpine advisories ALPINE-CVE-2020-18032

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • graphviz Azure Linux 3.0 2.42.4-10
  • graphviz CBL-Mariner 2.0 2.42.4-6

azure linux advisories AZL-34767AZL-6454

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2020-18032 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-2020-18032 updated cvss 7.8

graphviz: off-by-one in parse_reclbl() in lib/common/shapes.c

  • Red Hat Enterprise Linux 6 graphviz, graphviz-gd, graphviz-lua, graphviz-php, graphviz-tcl, graphviz-java, +5 more Red Hat Enterprise Linux 7 graphviz, graphviz-gd, graphviz-lua, graphviz-php, graphviz-tcl, graphviz-java, +6 more
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) graphviz-gd 2.40.1-43.el8, graphviz-python3 2.40.1-43.el8 Red Hat Enterprise Linux AppStream (v. 8) graphviz 2.40.1-43.el8
    fixed: vendor fix RHSA-2021:4256
  • Red Hat Enterprise Linux 9 graphviz, graphviz-gd, graphviz-ruby, graphviz-python3
    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

2.61% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gitlab.com https://gitlab.com/graphviz/graphviz/-/issues/1700 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

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.