CVE-2016-9841

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

Published: 2017-05-23 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-9841 is rated High Risk (67/100): CVSS Critical severity, with high exploitation likelihood (EPSS 7.49%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-9841

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 19.18% 7.49% -11.69%
2 2026-06-06 23.61% 19.18% -4.43%
3 2026-06-05 — 23.61% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-9841

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-9841

OS Trackers for CVE-2016-9841

vendor priority summary link
debian not yet assigned CVE-2016-9841 not yet assigned priority: Debian including 2 source packages (rsync, zlib), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2016-9841
gentoo normal CVE-2016-9841: 2 GLSA(s) (201701-56, 202007-54), 2 atom(s) (net-misc/rsync, sys-libs/zlib); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-9841
redhat low — https://access.redhat.com/security/cve/CVE-2016-9841
suse critical CVE-2016-9841 severity critical: SUSE including 198 source package names (0.9.1:libz1-1.2.8-11.1, 1.0.0:libz1-1.2.8-11.1, …), 518 product×package rows across 88 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (88 product lines)): Fixed 405, Known Not Affected 113. https://www.suse.com/security/cve/CVE-2016-9841/
ubuntu low CVE-2016-9841 low priority: Ubuntu including 4 source packages (klibc, rsync, zlib, zsync), 61 status rows across 23 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, precise, questing, trusty, upstream, xenial, yakkety, zesty): released 28, not-affected 18, needs-triage 9, ignored 5, needed 1. https://ubuntu.com/security/CVE-2016-9841

Affected software / configurations for CVE-2016-9841

Vendor Product Version Raw CPE
zlib zlib >= 1.2.0, < 1.2.9 cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
opensuse leap 42.2 cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:*
opensuse opensuse 13.2 cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
oracle database_server 18c cpe:2.3:a:oracle:database_server:18c:*:*:*:*:*:*:*
oracle jdk 1.6.0 cpe:2.3:a:oracle:jdk:1.6.0:update161:*:*:*:*:*:*
oracle jdk 1.7.0 cpe:2.3:a:oracle:jdk:1.7.0:update151:*:*:*:*:*:*
oracle jdk 1.8.0 cpe:2.3:a:oracle:jdk:1.8.0:update144:*:*:*:*:*:*
oracle jre 1.6.0 cpe:2.3:a:oracle:jre:1.6.0:update161:*:*:*:*:*:*
oracle jre 1.7.0 cpe:2.3:a:oracle:jre:1.7.0:update151:*:*:*:*:*:*
oracle jre 1.8.0 cpe:2.3:a:oracle:jre:1.8.0:update144:*:*:*:*:*:*
oracle mysql >= 5.5.0, <= 5.5.61 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
oracle mysql >= 5.6.0, <= 5.6.41 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
oracle mysql >= 5.7.0, <= 5.7.23 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
oracle mysql >= 8.0.0, <= 8.0.12 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
redhat satellite 5.8 cpe:2.3:a:redhat:satellite:5.8:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.4 cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.5 cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0 cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
apple iphone_os < 11 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple mac_os_x >= 10.0.0, < 10.13.0 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple tvos < 11.0 cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos < 4 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
netapp active_iq_unified_manager >= 7.3 cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:windows:*:*
netapp active_iq_unified_manager >= 9.5 cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:vmware_vsphere:*:*
netapp cloud_backup — cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
netapp e-series_santricity_management — cpe:2.3:a:netapp:e-series_santricity_management:-:*:*:*:*:vmware_sra:*:*
netapp e-series_santricity_management — cpe:2.3:a:netapp:e-series_santricity_management:-:*:*:*:*:vmware_vasa:*:*
netapp e-series_santricity_management — cpe:2.3:a:netapp:e-series_santricity_management:-:*:*:*:*:vmware_vcenter:*:*
netapp e-series_santricity_os_controller >= 11.0.0, <= 11.70.1 cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
netapp e-series_santricity_storage_manager — cpe:2.3:a:netapp:e-series_santricity_storage_manager:-:*:*:*:*:*:*:*
netapp e-series_santricity_web_services — cpe:2.3:a:netapp:e-series_santricity_web_services:-:*:*:*:*:web_services_proxy:*:*
netapp oncommand_balance — cpe:2.3:a:netapp:oncommand_balance:-:*:*:*:*:*:*:*
netapp oncommand_insight — cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*
netapp oncommand_performance_manager — cpe:2.3:a:netapp:oncommand_performance_manager:-:*:*:*:*:vmware_vsphere:*:*
netapp oncommand_shift — cpe:2.3:a:netapp:oncommand_shift:-:*:*:*:*:*:*:*
netapp oncommand_unified_manager <= 7.1 cpe:2.3:a:netapp:oncommand_unified_manager:*:*:*:*:*:vsphere:*:*
netapp oncommand_unified_manager <= 7.1 cpe:2.3:a:netapp:oncommand_unified_manager:*:*:*:*:*:windows:*:*
netapp oncommand_unified_manager — cpe:2.3:a:netapp:oncommand_unified_manager:-:*:*:*:*:7-mode:*:*
netapp oncommand_workflow_automation — cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
netapp snapmanager — cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:oracle:*:*
netapp snapmanager — cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:sap:*:*
netapp solidfire — cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
netapp steelstore_cloud_integrated_storage — cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*
netapp storage_replication_adapter_for_clustered_data_ontap — cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:-:*:*:*:*:vmware_vsphere:*:*
netapp symantec_netbackup — cpe:2.3:a:netapp:symantec_netbackup:-:*:*:*:*:*:*:*
netapp vasa_provider_for_clustered_data_ontap >= 7.2 cpe:2.3:a:netapp:vasa_provider_for_clustered_data_ontap:*:*:*:*:*:*:*:*
netapp virtual_storage_console — cpe:2.3:a:netapp:virtual_storage_console:-:*:*:*:*:vmware_vsphere:*:*
netapp hci_storage_node — cpe:2.3:h:netapp:hci_storage_node:-:*:*:*:*:*:*:*
nodejs node.js >= 4.0.0, <= 4.1.2 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 4.2.0, < 4.8.2 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 6.0.0, <= 6.8.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 6.9.0, < 6.10.2 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 7.0.0, < 7.6.0 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*

References for CVE-2016-9841

URL Tags
http://lists.opensuse.org/opensuse-updates/2016-12/msg00127.html
http://lists.opensuse.org/opensuse-updates/2017-01/msg00050.html
http://lists.opensuse.org/opensuse-updates/2017-01/msg00053.html
http://www.openwall.com/lists/oss-security/2016/12/05/21
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/95131
http://www.securitytracker.com/id/1039427
http://www.securitytracker.com/id/1039596
https://access.redhat.com/errata/RHSA-2017:1220
https://access.redhat.com/errata/RHSA-2017:1221
https://access.redhat.com/errata/RHSA-2017:1222
https://access.redhat.com/errata/RHSA-2017:2999
https://access.redhat.com/errata/RHSA-2017:3046
https://access.redhat.com/errata/RHSA-2017:3047
https://access.redhat.com/errata/RHSA-2017:3453
https://bugzilla.redhat.com/show_bug.cgi?id=1402346
https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb
https://lists.debian.org/debian-lts-announce/2019/03/msg00027.html
https://lists.debian.org/debian-lts-announce/2020/01/msg00030.html
https://security.gentoo.org/glsa/201701-56
https://security.gentoo.org/glsa/202007-54
https://security.netapp.com/advisory/ntap-20171019-0001/
https://support.apple.com/HT208112
https://support.apple.com/HT208113
https://support.apple.com/HT208115
https://support.apple.com/HT208144
https://usn.ubuntu.com/4246-1/
https://usn.ubuntu.com/4292-1/
https://wiki.mozilla.org/MOSS/Secure_Open_Source/Completed#zlib
https://wiki.mozilla.org/images/0/09/Zlib-report.pdf
https://www.oracle.com/security-alerts/cpujul2020.html
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