CVE-2016-9843

CVE-2016-9843 is a critical vulnerability published on May 23, 2017. 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.

CVE-2016-9843 was first published in the National Vulnerability Database on May 23, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

CVE-2016-9843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

CVE-2016-9843 has a CVSS v3 base score of 9.8 (NVD).

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-9843, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.