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
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.8%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
51
EG Risk 51/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
5.8%
EPSS %ILE
92nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 23, 2017

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Sep 29, 2026
Patch available.
generic

CVE-2016-9840 - PSIRT.COM

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
generic
http://www.securitytracker.com/id/1041888
generic
http://www.securitytracker.com/id/1039427

Vendor Advisories for CVE-2016-9843(8)

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 / EcosystemFix (by version range) / 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.

Affected Packages

(34 across 27 ecosystems)
Alpine:v3.5(2)
PackageVulnerable rangeFix by version rangeDependents
perl—
  • every version up to 5.24.3-r1: fixed in 5.24.3-r1
—
zlib—
  • 1.2.0 up to 1.2.11-r0: fixed in 1.2.11-r0
—
Alpine:v3.6(2)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.1.37-r0: fixed in 10.1.37-r0
—
perl—
  • every version up to 5.24.3-r1: fixed in 5.24.3-r1
—
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.1.3-6: fixed in 3.1.3-6
—
zlib—
  • every version up to 1:1.2.8.dfsg-3: fixed in 1:1.2.8.dfsg-3
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.1.3-6: fixed in 3.1.3-6
—
zlib—
  • every version up to 1:1.2.8.dfsg-3: fixed in 1:1.2.8.dfsg-3
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.1.3-6: fixed in 3.1.3-6
—
zlib—
  • every version up to 1:1.2.8.dfsg-3: fixed in 1:1.2.8.dfsg-3
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.1.3-6: fixed in 3.1.3-6
—
zlib—
  • every version up to 1:1.2.8.dfsg-3: fixed in 1:1.2.8.dfsg-3
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
rsync3.1.1-3, 3.1.1-3+deb8u1
  • every version up to 3.1.1-3+deb8u2: fixed in 3.1.1-3+deb8u2
—
zlib1:1.2.8.dfsg-2
  • every version up to 1:1.2.8.dfsg-2+deb8u1: fixed in 1:1.2.8.dfsg-2+deb8u1
—
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—
Alpine:v3.3(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • 1.2.0 up to 1.2.11-r0: fixed in 1.2.11-r0
—
Alpine:v3.4(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • 1.2.0 up to 1.2.11-r0: fixed in 1.2.11-r0
—
Alpine:v3.7(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.1.37-r0: fixed in 10.1.37-r0
—
Alpine:v3.8(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.2.19-r0: fixed in 10.2.19-r0
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • 5.5.0 up to 10.3.11-r0: fixed in 10.3.11-r0
—

Additional Vendor Advisories

(3)

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 6× in last 7d / 24× 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 170 total refreshes for this CVE.

  1. 2026-10-05 17:38 UTCEPSS rescore
  2. 2026-10-04 14:18 UTCOSV refresh
  3. 2026-10-03 14:21 UTCEPSS rescore
  4. 2026-10-03 14:21 UTCEPSS rescore
  5. 2026-09-30 14:58 UTCEPSS rescore
  6. 2026-09-30 09:18 UTCEG score recompute
  7. 2026-09-28 13:45 UTCEPSS rescore
  8. 2026-09-27 13:40 UTCEPSS rescore
  9. 2026-09-26 15:53 UTCEPSS rescore
  10. 2026-09-26 15:53 UTCEPSS rescore
  11. 2026-09-24 13:59 UTCEPSS rescore
  12. 2026-09-23 13:41 UTCEPSS rescore
  13. 2026-09-20 20:09 UTCEPSS rescore
  14. 2026-09-19 15:35 UTCEPSS rescore
  15. 2026-09-18 19:22 UTCEPSS rescore
  16. 2026-09-17 19:22 UTCEPSS rescore
  17. 2026-09-16 05:05 UTCEPSS rescore
  18. 2026-09-15 03:14 UTCOSV refresh
  19. 2026-09-15 03:05 UTCEPSS rescore
  20. 2026-09-13 16:41 UTCEPSS rescore
  21. 2026-09-12 14:55 UTCEPSS rescore
  22. 2026-09-11 14:46 UTCEPSS rescore
  23. 2026-09-11 09:31 UTCEPSS rescore
  24. 2026-09-10 09:26 UTCEPSS rescore
  25. 2026-09-04 13:56 UTCEPSS rescore
Show 75 more
  1. 2026-09-02 14:07 UTCEPSS rescore
  2. 2026-09-01 13:48 UTCEPSS rescore
  3. 2026-09-01 03:31 UTCEPSS rescore
  4. 2026-08-28 21:35 UTCEPSS rescore
  5. 2026-08-27 14:20 UTCEPSS rescore
  6. 2026-08-27 03:00 UTCOSV refresh
  7. 2026-08-26 14:41 UTCEPSS rescore
  8. 2026-08-25 13:44 UTCEPSS rescore
  9. 2026-08-21 23:44 UTCEPSS rescore
  10. 2026-08-19 16:59 UTCEPSS rescore
  11. 2026-08-18 13:43 UTCEPSS rescore
  12. 2026-08-16 14:51 UTCEPSS rescore
  13. 2026-08-16 02:10 UTCEPSS rescore
  14. 2026-08-15 01:25 UTCEPSS rescore
  15. 2026-08-12 13:46 UTCEPSS rescore
  16. 2026-08-11 13:36 UTCEPSS rescore
  17. 2026-08-10 16:08 UTCOSV refresh
  18. 2026-08-09 13:42 UTCEPSS rescore
  19. 2026-08-08 16:32 UTCEPSS rescore
  20. 2026-08-07 16:22 UTCEPSS rescore
  21. 2026-08-06 13:42 UTCEPSS rescore
  22. 2026-08-05 19:12 UTCEPSS rescore
  23. 2026-08-04 15:05 UTCEPSS rescore
  24. 2026-08-02 02:22 UTCEPSS rescore
  25. 2026-08-01 04:11 UTCEPSS rescore
  26. 2026-07-30 16:24 UTCEPSS rescore
  27. 2026-07-30 01:26 UTCEPSS rescore
  28. 2026-07-30 01:26 UTCEPSS rescore
  29. 2026-07-28 15:31 UTCEPSS rescore
  30. 2026-07-26 14:50 UTCEPSS rescore
  31. 2026-07-25 17:00 UTCOSV refresh
  32. 2026-07-25 14:13 UTCEPSS rescore
  33. 2026-07-24 14:13 UTCEPSS rescore
  34. 2026-07-23 14:15 UTCEPSS rescore
  35. 2026-07-23 01:24 UTCEG score recompute
  36. 2026-07-22 22:04 UTCEG score recompute
  37. 2026-07-22 14:04 UTCEPSS rescore
  38. 2026-07-21 15:21 UTCEPSS rescore
  39. 2026-07-21 15:21 UTCEPSS rescore
  40. 2026-07-20 17:04 UTCEPSS rescore
  41. 2026-07-19 14:28 UTCEPSS rescore
  42. 2026-07-19 14:28 UTCEPSS rescore
  43. 2026-07-19 02:26 UTCEPSS rescore
  44. 2026-07-19 02:26 UTCEPSS rescore
  45. 2026-07-18 10:00 UTCEPSS rescore
  46. 2026-07-18 10:00 UTCEPSS rescore
  47. 2026-07-16 16:59 UTCEPSS rescore
  48. 2026-07-16 16:59 UTCEPSS rescore
  49. 2026-07-15 16:54 UTCEPSS rescore
  50. 2026-07-15 16:54 UTCEPSS rescore
  51. 2026-07-15 01:56 UTCEPSS rescore
  52. 2026-07-13 22:26 UTCEPSS rescore
  53. 2026-07-12 05:43 UTCEPSS rescore
  54. 2026-07-12 05:43 UTCEPSS rescore
  55. 2026-07-11 08:24 UTCEPSS rescore
  56. 2026-07-09 19:06 UTCEPSS rescore
  57. 2026-07-08 15:10 UTCEPSS rescore
  58. 2026-07-08 11:57 UTCOSV refresh
  59. 2026-07-07 13:42 UTCEPSS rescore
  60. 2026-07-06 16:24 UTCEPSS rescore
  61. 2026-07-06 16:24 UTCEPSS rescore
  62. 2026-07-06 02:20 UTCEPSS rescore
  63. 2026-07-06 02:20 UTCEPSS rescore
  64. 2026-07-05 02:27 UTCEPSS rescore
  65. 2026-07-04 06:28 UTCEPSS rescore
  66. 2026-07-01 15:02 UTCEPSS rescore
  67. 2026-06-30 23:19 UTCEPSS rescore
  68. 2026-06-30 23:19 UTCEPSS rescore
  69. 2026-06-29 14:03 UTCEPSS rescore
  70. 2026-06-28 14:04 UTCEPSS rescore
  71. 2026-06-28 04:53 UTCEPSS rescore
  72. 2026-06-27 03:05 UTCEPSS rescore
  73. 2026-06-25 13:47 UTCEPSS rescore
  74. 2026-06-24 14:02 UTCEPSS rescore
  75. 2026-06-23 21:30 UTCEPSS rescore

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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 on May 23, 2017, with the most recent update on June 17, 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 5.8% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
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?
A fix for CVE-2016-9843 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2016-9843 are linked in the Vendor Advisories panel on this page.

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