CVE-2016-9843

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
92.3%
KEV
Not listed

Published

May 23, 2017

Last Modified

May 13, 2026

Advisory Details (4)

Auto-updated May 14, 2026
No patch confirmed yet.
generic
http://www.securitytracker.com/id/1041888
generic
http://www.securitytracker.com/id/1039427
generic
http://www.securityfocus.com/bid/95131
generic

oss-security - Re: CVE Request: zlib security issues found during audit

http://www.openwall.com/lists/oss-security/2016/12/05/21

Vendor Advisories for CVE-2016-9843(7)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuzlib1g-udeb (1:1.2.8.dfsg-2ubuntu4.3) @ xenial2026-05-20ubuntu
ubuntursync (3.1.1-3ubuntu1.3) @ xenial2026-05-20ubuntu
ubuntulibklibc-dev (2.0.10-4ubuntu0.2) @ jammy2026-05-20ubuntu
redhatjava-1.8.0-ibm-1:1.8.0.5.5-1jpp.1.el6_92017-12-13redhat
redhatjava-1.6.0-sun-1:1.6.0.171-1jpp.4.el72017-10-24redhat
redhatjava-1.7.0-oracle-1:1.7.0.161-1jpp.4.el72017-10-24redhat
redhatjava-1.8.0-oracle-1:1.8.0.151-1jpp.5.el72017-10-23redhat
redhatjava-1.6.0-ibm-1:1.6.0.16.45-1jpp.1.el6_92017-05-10redhat
redhatjava-1.8.0-ibm-1:1.8.0.4.5-1jpp.1.el7_32017-05-10redhat
redhatjava-1.7.1-ibm-1:1.7.1.4.5-1jpp.1.el7_32017-05-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-07-23 01:24 UTCEG score recompute
  2. 2026-07-22 22:04 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
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  22. 2026-06-19 23:53 UTCOSV refresh
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  49. 2026-05-31 02:25 UTCOSV refresh
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  65. 2026-05-20 10:35 UTCVendor advisory
  66. 2026-05-20 10:35 UTCGHSA enrichment
  67. 2026-05-20 06:18 UTCVendor advisory
  68. 2026-05-20 06:18 UTCGHSA enrichment
  69. 2026-05-20 02:01 UTCVendor advisory
  70. 2026-05-20 02:01 UTCGHSA enrichment
  71. 2026-05-19 21:44 UTCVendor advisory
  72. 2026-05-19 21:44 UTCGHSA enrichment
  73. 2026-05-19 17:27 UTCVendor advisory
  74. 2026-05-19 17:27 UTCGHSA enrichment
  75. 2026-05-19 13:10 UTCVendor advisory

Frequently asked(5)

What is 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.
When was CVE-2016-9843 disclosed?
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.
Is CVE-2016-9843 actively exploited?
CVE-2016-9843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-9843?
CVE-2016-9843 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-9843?
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.

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