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CVE-2016-9841

35
FAUCET Score

CVE-2016-9841 describes a critical vulnerability in zlib version 1.2.8, specifically within the inffast.c component, due to improper pointer arithmetic. This flaw affects a wide range of products including Apple, Canonical, Debian, Node.js, Oracle, and Red Hat, among others. With a CVSS score of 9.8, it presents a severe risk, allowing unauthenticated attackers to achieve high impact on confidentiality, integrity, and availability over a network. Despite its critical severity and high EPSS score, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.2.0, < 1.2.9CPE matchmatch criteria
cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
42.2CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.55%
Probability of exploitation in next 30 days
EPSS Percentile
93.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0755 is in the 89th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (18)

denopatch availablevia llm_extracted
View patch
keraspatch availablevia llm_extracted
View patch
microsoftpatch availablevia msrc
Product: 16826-16817Fixed in: 1.3.8-1
microsoftpatch availablevia msrc
Product: azl3 fltk 1.3.8-1 on Azure Linux 3.0Fixed in: 1.3.8-1
microsoftpatch availablevia msrc
Product: 16826-17084Fixed in: 1.3.8-1
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 6Fixed in: java-1.6.0-sun-1:1.6.0.171-1jpp.4.el6
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 7Fixed in: java-1.8.0-oracle-1:1.8.0.151-1jpp.5.el7
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 7Fixed in: java-1.7.0-oracle-1:1.7.0.161-1jpp.4.el7
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 7Fixed in: java-1.6.0-sun-1:1.6.0.171-1jpp.4.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: java-1.8.0-ibm-1:1.8.0.4.5-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: java-1.7.1-ibm-1:1.7.1.4.5-1jpp.2.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: java-1.6.0-ibm-1:1.6.0.16.45-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7 SupplementaryFixed in: java-1.8.0-ibm-1:1.8.0.4.5-1jpp.1.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7 SupplementaryFixed in: java-1.7.1-ibm-1:1.7.1.4.5-1jpp.1.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Satellite 5.8Fixed in: java-1.8.0-ibm-1:1.8.0.5.5-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Satellite 5.8 ELSFixed in: java-1.8.0-ibm-1:1.8.0.5.5-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 6Fixed in: java-1.7.0-oracle-1:1.7.0.161-1jpp.3.el6
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 6Fixed in: java-1.8.0-oracle-1:1.8.0.151-1jpp.1.el6
View patch

Vendor Advisories (4)

denollm-deno-b67a3af2ce0be075CRITICAL

HP ThinPro 8.0 SP 9 Security Updates

Jun 17, 2024
kerasllm-keras-7d8c31fee70361dcCRITICAL

HP ThinPro 8.0 SP 9 Security Updates

Jun 17, 2024
microsoft2017-May/CVE-2016-9841Critical

inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic

May 9, 2017
redhatCVE-2016-9841Low

zlib: Out-of-bounds pointer arithmetic in inffast.c

Sep 22, 2016

References

cert-portal.siemens.com / productcert/html/ssa-470355.html
lists.opensuse.org / opensuse-updates/2016-12/msg00127.html
lists.opensuse.org / opensuse-updates/2017-01/msg00050.html
lists.opensuse.org / opensuse-updates/2017-01/msg00053.html
access.redhat.com / errata/RHSA-2017:1220
access.redhat.com / errata/RHSA-2017:1221
access.redhat.com / errata/RHSA-2017:1222
access.redhat.com / errata/RHSA-2017:2999
access.redhat.com / errata/RHSA-2017:3046
access.redhat.com / errata/RHSA-2017:3047
access.redhat.com / errata/RHSA-2017:3453
bugzilla.redhat.com / show_bug.cgi
github.com / madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb
lists.debian.org / debian-lts-announce/2019/03/msg00027.html
lists.debian.org / debian-lts-announce/2020/01/msg00030.html
security.gentoo.org / glsa/201701-56
security.gentoo.org / glsa/202007-54
security.netapp.com / advisory/ntap-20171019-0001
support.apple.com / HT208112
support.apple.com / HT208113
support.apple.com / HT208115
support.apple.com / HT208144
usn.ubuntu.com / 4246-1
usn.ubuntu.com / 4292-1
wiki.mozilla.org / images/0/09/Zlib-report.pdf
wiki.mozilla.org / MOSS/Secure_Open_Source/Completed
oracle.com / security-alerts/cpujul2020.html
openwall.com / lists/oss-security/2016/12/05/21
oracle.com / technetwork/security-advisory/cpujul2018-4258247.html
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
oracle.com / technetwork/security-advisory/cpuoct2018-4428296.html
securityfocus.com / bid/95131
securitytracker.com / id/1039427
securitytracker.com / id/1039596