CVE-2023-39456

HIGHNVD 7.58.1▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.1 because EPSS predicts 53% probability of exploitation within the next 30 days (top 1.1% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
8.1EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 53%
CISA-KEV: Not listedEPSS PROB: 53%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2.

Users are recommended to upgrade to version 9.2.3, which fixes the issue.

CVSS v3
7.5
EG Score
8.1(high)
EG Risk
73(Track)
EG Risk 73/100SSVC: 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
Severity81% × 45%
Exploitation53% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
53%
EPSS %ILE
99%
KEV
Not listed

Published

October 17, 2023

Last Modified

June 12, 2025

References (10)

Affected Packages

(1 across 1 ecosystem)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
trafficserver9.2.0+ds-2, 9.2.0+ds-2+deb12u1, 9.2.1+ds-1, 9.2.2+ds-1, 9.2.3+ds-19.2.3+ds-1+deb12u1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× 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.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-08-07 16:25 UTCEPSS rescore
  2. 2026-08-06 13:45 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
  4. 2026-08-04 15:07 UTCEPSS rescore
  5. 2026-08-01 23:36 UTCOSV refresh
  6. 2026-08-01 04:14 UTCEPSS rescore
  7. 2026-08-01 04:13 UTCEPSS rescore
  8. 2026-07-30 16:26 UTCEPSS rescore
  9. 2026-07-30 16:26 UTCEPSS rescore
  10. 2026-07-30 01:28 UTCEPSS rescore
  11. 2026-07-30 01:28 UTCEPSS rescore
  12. 2026-07-28 15:34 UTCEPSS rescore
  13. 2026-07-28 15:34 UTCEPSS rescore
  14. 2026-07-26 14:52 UTCEPSS rescore
  15. 2026-07-26 14:52 UTCEPSS rescore
  16. 2026-07-25 14:16 UTCEPSS rescore
  17. 2026-07-24 14:16 UTCEPSS rescore
  18. 2026-07-23 14:16 UTCEPSS rescore
  19. 2026-07-23 14:16 UTCEPSS rescore
  20. 2026-07-23 02:25 UTCEG score recompute▲ 0.60
  21. 2026-07-22 23:12 UTCEG score recompute
  22. 2026-07-22 14:06 UTCEPSS rescore
  23. 2026-07-21 15:23 UTCEPSS rescore
  24. 2026-07-21 15:23 UTCEPSS rescore
  25. 2026-07-20 17:06 UTCEPSS rescore
Show 75 more
  1. 2026-07-19 14:29 UTCEPSS rescore
  2. 2026-07-19 02:27 UTCEPSS rescore
  3. 2026-07-16 17:01 UTCEPSS rescore
  4. 2026-07-16 17:01 UTCEPSS rescore
  5. 2026-07-15 16:56 UTCEPSS rescore
  6. 2026-07-15 16:56 UTCEPSS rescore
  7. 2026-07-15 06:49 UTCOSV refresh
  8. 2026-07-15 01:58 UTCEPSS rescore
  9. 2026-07-13 22:28 UTCEPSS rescore
  10. 2026-07-13 22:28 UTCEPSS rescore
  11. 2026-07-13 06:11 UTCEPSS rescore
  12. 2026-07-13 06:11 UTCEPSS rescore
  13. 2026-07-12 05:45 UTCEPSS rescore
  14. 2026-07-12 05:45 UTCEPSS rescore
  15. 2026-07-11 08:26 UTCEPSS rescore
  16. 2026-07-11 08:26 UTCEPSS rescore
  17. 2026-07-09 19:08 UTCEPSS rescore
  18. 2026-07-08 15:13 UTCEPSS rescore
  19. 2026-07-05 02:29 UTCEPSS rescore
  20. 2026-07-01 15:05 UTCEPSS rescore
  21. 2026-06-30 23:21 UTCEPSS rescore
  22. 2026-06-30 23:21 UTCEPSS rescore
  23. 2026-06-28 04:55 UTCEPSS rescore
  24. 2026-06-28 04:55 UTCEPSS rescore
  25. 2026-06-27 07:34 UTCOSV refresh
  26. 2026-06-27 03:07 UTCEPSS rescore
  27. 2026-06-27 03:07 UTCEPSS rescore
  28. 2026-06-25 13:48 UTCEPSS rescore
  29. 2026-06-25 13:48 UTCEPSS rescore
  30. 2026-06-24 14:04 UTCEPSS rescore
  31. 2026-06-24 14:04 UTCEPSS rescore
  32. 2026-06-23 21:31 UTCEPSS rescore
  33. 2026-06-23 21:31 UTCEPSS rescore
  34. 2026-06-21 01:58 UTCEPSS rescore
  35. 2026-06-21 01:58 UTCEPSS rescore
  36. 2026-06-19 19:24 UTCEPSS rescore
  37. 2026-06-19 19:24 UTCEPSS rescore
  38. 2026-06-18 17:51 UTCEPSS rescore
  39. 2026-06-17 17:51 UTCEPSS rescore
  40. 2026-06-17 17:51 UTCEPSS rescore
  41. 2026-06-16 17:51 UTCEPSS rescore
  42. 2026-06-16 17:51 UTCEPSS rescore
  43. 2026-06-15 17:47 UTCEPSS rescore
  44. 2026-06-15 17:47 UTCEPSS rescore
  45. 2026-06-14 23:16 UTCEPSS rescore
  46. 2026-06-13 22:59 UTCEPSS rescore
  47. 2026-06-13 22:59 UTCEPSS rescore
  48. 2026-06-12 23:10 UTCEPSS rescore
  49. 2026-06-12 23:10 UTCEPSS rescore
  50. 2026-06-11 13:59 UTCEPSS rescore
  51. 2026-06-11 13:59 UTCEPSS rescore
  52. 2026-06-10 22:17 UTCEPSS rescore
  53. 2026-06-10 13:21 UTCEPSS rescore
  54. 2026-06-10 13:21 UTCEPSS rescore
  55. 2026-06-09 17:47 UTCOSV refresh
  56. 2026-06-08 14:16 UTCEPSS rescore
  57. 2026-06-08 14:16 UTCEPSS rescore
  58. 2026-06-07 15:23 UTCEPSS rescore
  59. 2026-06-07 15:23 UTCEPSS rescore
  60. 2026-06-06 13:46 UTCEPSS rescore
  61. 2026-06-06 13:46 UTCEPSS rescore
  62. 2026-06-05 22:46 UTCEPSS rescore
  63. 2026-06-05 22:46 UTCEPSS rescore
  64. 2026-06-05 06:09 UTCEPSS rescore
  65. 2026-06-05 06:09 UTCEPSS rescore
  66. 2026-06-05 06:09 UTCEPSS rescore
  67. 2026-06-04 13:11 UTCEPSS rescore
  68. 2026-06-04 13:11 UTCEPSS rescore
  69. 2026-06-02 20:12 UTCEPSS rescore
  70. 2026-06-02 20:12 UTCEPSS rescore
  71. 2026-06-01 13:51 UTCEPSS rescore
  72. 2026-06-01 13:51 UTCEPSS rescore
  73. 2026-05-31 22:30 UTCEPSS rescore
  74. 2026-05-31 22:29 UTCEPSS rescore
  75. 2026-05-31 00:15 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-39456?
CVE-2023-39456 is a high vulnerability published on October 17, 2023. Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 9.2.3, which fixes the issue.
When was CVE-2023-39456 disclosed?
CVE-2023-39456 was first published in the National Vulnerability Database on October 17, 2023, with the most recent update on June 12, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-39456 actively exploited?
CVE-2023-39456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53% probability of exploitation in the next 30 days, which ranks it in the top 1.1% of all scored CVEs.
What is the CVSS score of CVE-2023-39456?
CVE-2023-39456 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.1.
How do I remediate CVE-2023-39456?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39456, 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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