CVE-2023-33866

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-07-19. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 12.1.2.15332. By prematurely deleting objects associated with pages, a specially crafted PDF document can trigger the reuse of previously freed memory, which can lead to arbitrary code execution. An attacker needs to trick the user into opening the malicious file to trigger this vulnerability. Exploitation is also possible if a user visits a specially crafted, malicious site if the browser plugin extension is enabled.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

July 19, 2023

Last Modified

November 4, 2025

Advisory Details (2)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

TALOS-2023-1757 || Cisco Talos Intelligence Group - Comprehensive Threat Intelligence

https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1757
generic🟡 PoC Available

TALOS-2023-1757 || Cisco Talos Intelligence Group - Comprehensive Threat Intelligence

https://talosintelligence.com/vulnerability_reports/TALOS-2023-1757

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 26× 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 158 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2023-33866?
CVE-2023-33866 is a high vulnerability published on July 19, 2023. A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 12.1.2.15332. By prematurely deleting objects associated with pages, a specially crafted PDF document can trigger the reuse of previously freed memory, which can lead to arbitrary code execution.…
When was CVE-2023-33866 disclosed?
CVE-2023-33866 was first published in the National Vulnerability Database on July 19, 2023, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-33866 actively exploited?
CVE-2023-33866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.0% of all scored CVEs.
What is the CVSS score of CVE-2023-33866?
CVE-2023-33866 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-33866?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-33866, 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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