CVE-2016-9843
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.77%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.77% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- zlib/zlib · opensuse/leap · opensuse/opensuse · debian/debian linux · canonical/ubuntu linux · oracle/database server · oracle/jdk · oracle/jre · oracle/mysql · redhat/satellite · redhat/enterprise linux desktop · redhat/enterprise linux eus · redhat/enterprise linux server · redhat/enterprise linux workstation · apple/iphone os · apple/mac os x · apple/tvos · apple/watchos · netapp/active iq unified manager · netapp/oncommand insight · +4 more
- Source
- security@opentext.com
EPSS 5.8% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.