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Fencer Intel
critical 9.6

CVE-2020-15999 kev in the critical feed json

Heap buffer overflow in CefSharp

published 6y ago modified 3mo ago also EUVD-2020-1435 , GHSA-pv36-h7jh-qm62 , JLSEC-2026-456

cvss
9.6
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
63.9%
EPSS 63.9% chance of exploitation in 30 days, percentile 99.2%
public exploits
0
none known

Summary

Heap buffer overflow in Freetype in Google Chrome prior to 86.0.4240.111 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • nuget CefSharp.Common 85.3.130
  • nuget CefSharp.Wpf 85.3.130
  • nuget CefSharp.WinForms 85.3.130
  • nuget CefSharp.Wpf.HwndHost 85.3.130
  • julia FreeType2_jll 2.10.4+0
  • Google Chrome 86.0.4240.111
  • freetype Debian 14, Debian 13, Debian 12 2.10.2+dfsg-4

debian advisories DEBIAN-CVE-2020-15999

  • freetype Ubuntu 16.04 LTS 2.6.1-0.1ubuntu2.5
  • freetype Ubuntu 18.04 LTS 2.8.1-2ubuntu2.1
  • freetype Ubuntu 20.04 LTS 2.10.1-2ubuntu0.1
  • chromium-browser Ubuntu 16.04 LTS 86.0.4240.198-0ubuntu0.16.04.1
  • chromium-browser Ubuntu 18.04 LTS 86.0.4240.198-0ubuntu0.18.04.1
  • freetype Ubuntu Pro 14.04 LTS 2.5.2-1ubuntu2.8+esm2

ubuntu advisories UBUNTU-CVE-2020-15999

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

  • freetype RHEL 7 2.8-14.el7_9.1
  • freetype-demos RHEL 7 2.8-14.el7_9.1
  • freetype RHEL 8 2.9.1-4.el8_3.1
  • chromium-browser RHEL 6 EXTRAS 86.0.4240.111-1.el6_10
  • freetype RHEL 8.0 E4S 2.9.1-4.el8_0.1
  • freetype RHEL 8.2 EUS 2.9.1-4.el8_2.1
  • freetype RHEL 8.1 EUS 2.9.1-4.el8_1.1

red hat advisories RHSA-2020:4907RHSA-2020:4949RHSA-2020:4952RHSA-2020:4951RHSA-2020:4950RHSA-2020:4351

  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 78.5.0-112.36.1
  • MozillaThunderbird SLE Workstation Extension 15 SP2, SLE Workstation Extension 15 SP1 78.5.0-3.107.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP2 78.5.0-8.17.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1 78.5.0-3.119.1
  • freetype2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 2.6.3-7.18.1
  • ft2demos SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +14 more 2.6.3-7.18.1
  • freetype2 SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 2.10.1-4.8.1
  • ft2demos SLE Module for Desktop Applications 15 SP2 2.10.1-4.8.1

suse advisories SUSE-SU-2020:3548-1SUSE-SU-2020:3528-1SUSE-SU-2020:3458-1SUSE-SU-2020:14548-1SUSE-SU-2020:3383-1SUSE-SU-2020:2998-1

  • python-Pillow openSUSE Tumbleweed 12.3.0-1.1
  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • freetype2 openSUSE Tumbleweed 2.11.0-1.2
  • python-Pillow openSUSE Tumbleweed 8.3.2-1.2
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1

opensuse advisories openSUSE-SU-2026:11261-1openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2024:10681-1openSUSE-SU-2024:10770-1

  • freetype AlmaLinux 8 2.9.1-4.el8_3.1

almalinux advisories ALSA-2020:4952

  • freetype Rocky Linux 8 2.9.1-4.el8_3.1

rocky linux advisories RLSA-2020:4952

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 83.0-r0
  • freetype Alpine 3.10 2.10.0-r1
  • freetype Alpine 3.11 2.10.1-r1
  • freetype Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 2.10.4-r0
  • freetype Alpine 3.9 2.9.1-r3
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 83.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 78.5.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 78.5.1-r0

alpine advisories ALPINE-CVE-2020-15999

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

  • freetype CBL-Mariner 2.0 2.11.1-1

azure linux advisories AZL-8324

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

  • freetype2 Arch Linux 2.10.4-1
  • lib32-freetype2 Arch Linux 2.10.4-1
  • firefox Arch Linux 83.0-1

arch linux advisories AVG-1254AVG-1255AVG-1279

Is CVE-2020-15999 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2020-15999 updated cvss 8.6

freetype: Heap-based buffer overflow due to integer truncation in Load_SBit_Png

  • Red Hat Enterprise Linux BaseOS (v. 8) freetype 2.9.1-4.el8_3.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4952
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.0) freetype 2.9.1-4.el8_0.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4949
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) freetype 2.9.1-4.el8_1.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4950
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) freetype 2.9.1-4.el8_2.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4951
  • Red Hat Enterprise Linux Client (v. 7) freetype 2.8-14.el7_9.1 Red Hat Enterprise Linux Client Optional (v. 7) freetype-demos 2.8-14.el7_9.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) freetype-demos 2.8-14.el7_9.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4907
  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 86.0.4240.111-1.el6_10 Red Hat Enterprise Linux HPC Node Supplementary (v. 6) chromium-browser 86.0.4240.111-1.el6_10
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4351
  • Red Hat Enterprise Linux Server (v. 7) freetype 2.8-14.el7_9.1 Red Hat Enterprise Linux Server Optional (v. 7) freetype-demos 2.8-14.el7_9.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4907
  • Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 86.0.4240.111-1.el6_10
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4351
show 3 more
  • Red Hat Enterprise Linux Workstation (v. 7) freetype 2.8-14.el7_9.1 Red Hat Enterprise Linux Workstation Optional (v. 7) freetype-demos 2.8-14.el7_9.1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4907
  • Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 86.0.4240.111-1.el6_10
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:4351
  • Red Hat Advanced Cluster Management for Kubernetes 2 go-freetype Red Hat Enterprise Linux 5 freetype Red Hat Enterprise Linux 6 firefox, freetype, thunderbird, freetype-demos
    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-23-264-05 updated cvss 8.8

Rockwell Automation Connected Components Workbench

  • Rockwell Automation Connected Components Workbench < R21
    affected: vendor fix, mitigation “Customers using the affected software are encouraged to apply the risk mitigations, if possible.” compatibility.rockwellautomation.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Timeline

  1. Found exploited as a 0-day (Project Zero)
  2. 0-day patched (Project Zero)
  3. Published
  4. Added to CISA KEV
  5. CISA patch deadline
  6. CISA SSVC: exploitation active

Known exploited

Added
5y ago
Patch by
2021-11-17 (4y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Google, Chrome FreeType
CISA name
Google Chrome FreeType Heap Buffer Overflow Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Found
2020-10-19
Patched
2020-10-20
Details
project zero root cause analysis

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

63.89% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • crbug.com https://crbug.com/1139963 referenced PoC, tagged "exploit" by a source, unverified
  • googleprojectzero.blogspot.com https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
OSV 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget CefSharp.Common
<85.3.130
85.3.130
nuget CefSharp.Wpf
<85.3.130
85.3.130
nuget CefSharp.WinForms
<85.3.130
85.3.130
nuget CefSharp.Wpf.HwndHost
<85.3.130
85.3.130
julia FreeType2_jll
<2.10.4+0
2.10.4+0

Affected products

  • Google Chrome

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write
Technology feeds

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.