CVE-2016-6309

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 70%
CISA-KEV: Not listedEPSS PROB: 70%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a denial of service (use-after-free) or possibly execute arbitrary code via a crafted TLS session.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
77(Track*)
EG Risk 77/100SSVC: 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%
Exploitation70% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
70%
EPSS %ILE
99%
KEV
Not listed

Published

September 26, 2016

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Sep 23, 2026
No patch confirmed yet.
generic

CVE-2016-6309 - PSIRT.COM

http://www.securityfocus.com/bid/93177
generic

CEC Juniper Community

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
generic
http://www.securitytracker.com/id/1036885

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 17× 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 110 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2016-6309?
CVE-2016-6309 is a critical vulnerability published on September 26, 2016. statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a denial of service (use-after-free) or possibly execute arbitrary code via a crafted TLS session.
When was CVE-2016-6309 disclosed?
CVE-2016-6309 was first published in the National Vulnerability Database on September 26, 2016, 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-2016-6309 actively exploited?
CVE-2016-6309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
What is the CVSS score of CVE-2016-6309?
CVE-2016-6309 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-6309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6309, 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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