← Vulnerability feed

Vulnerability record · CVE-2016-9843 · published 23 May 2017

CVE-2016-9843: Zlib vulnerability

Zlib · Zlib

The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big-endian CRC calculation.

9.8 CVSS 3.1 Critical EPSS 5.8% · top 7.2%
9.8CVSS 3.1 base score, v2 7.5
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
24Affected product versions listed by NVD
66References
17 Jun 2026Last modified by NVD

Description

The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big-endian CRC calculation.

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

Affected products

24 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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/1041888
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=1402351
https://github.com/madler/zlib/commit/d1d577490c15a0c6862473d7576352a9f18ef811
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-20181018-0002/
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
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

Track CVE-2016-9843 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-43300Apple iOS, iPadOS and macOS out-of-bounds write via malicious imageAn out-of-bounds write in Apple iOS, iPadOS and macOS is triggered when processing a malicious image file, causing memory corruption. Apple states th…KEVEPSS 22%analysed10.0CVE-2025-24201Apple WebKit out-of-bounds write allows sandbox escapeCVE-2025-24201 is an out-of-bounds write in Apple's WebKit that was addressed with improved checks. Maliciously crafted web content may break out of …KEVEPSS 3.8%analysed10.0CVE-2025-24085Apple iOS, iPadOS, macOS, tvOS, visionOS, watchOS Use-After-Free Privilege EscalationA use-after-free flaw in Apple's operating systems was fixed through improved memory management in iOS 18.3, iPadOS 18.3 and 17.7.6, macOS Sequoia 15…KEVEPSS 18%analysed9.8CVE-2025-31200Apple OS media parsing memory corruption allows code executionA memory corruption flaw in Apple's audio stream processing was fixed with improved bounds checking across iOS, iPadOS, macOS, tvOS, visionOS and wat…KEVEPSS 19%analysed9.8CVE-2025-31201Apple OS Pointer Authentication bypass via arbitrary read/writeApple removed vulnerable code that allowed an attacker holding arbitrary read and write capability to bypass Pointer Authentication across iOS, iPadO…KEVEPSS 14%analysed9.8CVE-2022-22587Apple iOS, iPadOS and macOS kernel memory corruption via out-of-bounds writeAn out-of-bounds write (CWE-787) in Apple iOS, iPadOS and macOS is caused by insufficient input validation and can corrupt memory. Apple states it is…KEVEPSS 12%analysed9.8CVE-2021-1870Apple WebKit logic flaw allows remote code executionA logic issue in Apple's WebKit was addressed with improved restrictions, affecting macOS Big Sur, Catalina, Mojave, iOS and iPadOS, plus WebKitGTK a…KEVEPSS 7.7%analysed9.8CVE-2021-1871Apple WebKit logic flaw allows remote code executionA logic issue in Apple's WebKit was addressed with improved restrictions. It affects macOS Big Sur, Catalina, Mojave, iOS and iPadOS, and a remote at…KEVEPSS 7.0%analysed

Source: NIST National Vulnerability Database (record CVE-2016-9843), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.