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)
EPSS
92.4%
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 10× in last 7d / 37× 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.

  1. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-06 16:24 UTCEPSS rescore
  3. 2026-07-06 16:24 UTCEPSS rescore
  4. 2026-07-06 02:20 UTCEPSS rescore
  5. 2026-07-06 02:20 UTCEPSS rescore
  6. 2026-07-05 02:27 UTCEPSS rescore
  7. 2026-07-04 06:28 UTCEPSS rescore
  8. 2026-07-01 15:02 UTCEPSS rescore
  9. 2026-06-30 23:19 UTCEPSS rescore
  10. 2026-06-30 23:19 UTCEPSS rescore
  11. 2026-06-29 14:03 UTCEPSS rescore
  12. 2026-06-28 14:04 UTCEPSS rescore
  13. 2026-06-28 04:53 UTCEPSS rescore
  14. 2026-06-27 03:05 UTCEPSS rescore
  15. 2026-06-25 13:47 UTCEPSS rescore
  16. 2026-06-24 14:02 UTCEPSS rescore
  17. 2026-06-23 21:30 UTCEPSS rescore
  18. 2026-06-22 14:23 UTCEPSS rescore
  19. 2026-06-21 14:54 UTCEPSS rescore
  20. 2026-06-21 14:54 UTCEPSS rescore
  21. 2026-06-21 01:57 UTCEPSS rescore
  22. 2026-06-21 01:57 UTCEPSS rescore
  23. 2026-06-19 23:53 UTCOSV refresh
  24. 2026-06-19 19:23 UTCEPSS rescore
  25. 2026-06-19 19:23 UTCEPSS rescore
Show 70 more
  1. 2026-06-18 17:50 UTCEPSS rescore
  2. 2026-06-18 17:50 UTCEPSS rescore
  3. 2026-06-17 17:50 UTCEPSS rescore
  4. 2026-06-17 17:50 UTCEPSS rescore
  5. 2026-06-16 17:50 UTCEPSS rescore
  6. 2026-06-15 17:45 UTCEPSS rescore
  7. 2026-06-14 23:14 UTCEPSS rescore
  8. 2026-06-14 23:14 UTCEPSS rescore
  9. 2026-06-13 22:57 UTCEPSS rescore
  10. 2026-06-13 22:57 UTCEPSS rescore
  11. 2026-06-12 23:09 UTCEPSS rescore
  12. 2026-06-11 13:57 UTCEPSS rescore
  13. 2026-06-07 15:22 UTCEPSS rescore
  14. 2026-06-07 15:22 UTCEPSS rescore
  15. 2026-06-06 13:45 UTCEPSS rescore
  16. 2026-06-06 13:45 UTCEPSS rescore
  17. 2026-06-05 22:44 UTCEPSS rescore
  18. 2026-06-04 13:10 UTCEPSS rescore
  19. 2026-06-04 13:10 UTCEPSS rescore
  20. 2026-06-02 20:10 UTCEPSS rescore
  21. 2026-06-01 13:49 UTCEPSS rescore
  22. 2026-06-01 13:49 UTCEPSS rescore
  23. 2026-05-31 22:28 UTCEPSS rescore
  24. 2026-05-31 22:28 UTCEPSS rescore
  25. 2026-05-31 02:25 UTCOSV refresh
  26. 2026-05-31 00:14 UTCEPSS rescore
  27. 2026-05-29 13:41 UTCEPSS rescore
  28. 2026-05-28 13:42 UTCEPSS rescore
  29. 2026-05-28 13:42 UTCEPSS rescore
  30. 2026-05-27 13:38 UTCEPSS rescore
  31. 2026-05-27 13:38 UTCEPSS rescore
  32. 2026-05-26 13:42 UTCEPSS rescore
  33. 2026-05-26 13:42 UTCEPSS rescore
  34. 2026-05-26 07:17 UTCEPSS rescore
  35. 2026-05-24 16:44 UTCEPSS rescore
  36. 2026-05-20 22:37 UTCEPSS rescore
  37. 2026-05-20 22:37 UTCEPSS rescore
  38. 2026-05-20 22:37 UTCEPSS rescore
  39. 2026-05-20 11:21 UTCEPSS rescore
  40. 2026-05-20 11:21 UTCEPSS rescore
  41. 2026-05-20 10:35 UTCEG score recompute
  42. 2026-05-20 10:35 UTCVendor advisory
  43. 2026-05-20 10:35 UTCGHSA enrichment
  44. 2026-05-20 06:18 UTCEG score recompute
  45. 2026-05-20 06:18 UTCVendor advisory
  46. 2026-05-20 06:18 UTCGHSA enrichment
  47. 2026-05-20 02:01 UTCEG score recompute
  48. 2026-05-20 02:01 UTCVendor advisory
  49. 2026-05-20 02:01 UTCGHSA enrichment
  50. 2026-05-19 21:44 UTCEG score recompute
  51. 2026-05-19 21:44 UTCVendor advisory
  52. 2026-05-19 21:44 UTCGHSA enrichment
  53. 2026-05-19 17:27 UTCEG score recompute
  54. 2026-05-19 17:27 UTCVendor advisory
  55. 2026-05-19 17:27 UTCGHSA enrichment
  56. 2026-05-19 13:10 UTCEG score recompute
  57. 2026-05-19 13:10 UTCVendor advisory
  58. 2026-05-19 13:10 UTCGHSA enrichment
  59. 2026-05-19 08:52 UTCEG score recompute
  60. 2026-05-19 08:52 UTCVendor advisory
  61. 2026-05-19 08:52 UTCGHSA enrichment
  62. 2026-05-19 04:35 UTCEG score recompute
  63. 2026-05-19 04:35 UTCVendor advisory
  64. 2026-05-19 04:35 UTCGHSA enrichment
  65. 2026-05-19 00:18 UTCEG score recompute
  66. 2026-05-19 00:18 UTCVendor advisory
  67. 2026-05-19 00:18 UTCGHSA enrichment
  68. 2026-05-18 21:30 UTCEPSS rescore
  69. 2026-05-18 21:30 UTCEPSS rescore
  70. 2026-05-18 21:30 UTCEPSS rescore

Related CVEs(same vendor)

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 92.4% 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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