CVE-2023-37209

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-07-05. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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: None knownExposed: 0

A fix is available — apply it.

A use-after-free condition existed in NotifyOnHistoryReload where a LoadingSessionHistoryEntry object was freed and a reference to that object remained. This resulted in a potentially exploitable condition when the reference to that object was later reused. This vulnerability affects Firefox < 115.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

July 5, 2023

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Aug 22, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox 115 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2023-22/
generic

Mozilla Firefox: Multiple Vulnerabilities (GLSA 202401-10) — Gentoo security

https://security.gentoo.org/glsa/202401-10
generic

1837993 - (CVE-2023-37209) AddressSanitizer: heap-use-after-free [@ mozilla::dom::CanonicalBrowsingContext::NotifyOnHistoryReload] with READ of size 8

https://bugzilla.mozilla.org/show_bug.cgi?id=1837993

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-locale-ast (115.0+build2-0ubuntu0.20.04.3) @ focal2026-05-24ubuntu

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.

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

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 159 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
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  13. 2026-08-25 13:46 UTCEPSS rescore
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  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
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  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
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  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 02:24 UTCEG score recompute
  25. 2026-07-22 23:11 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
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  34. 2026-07-18 10:03 UTCEPSS rescore
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  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

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Frequently asked(5)

What is CVE-2023-37209?
CVE-2023-37209 is a high vulnerability published on July 5, 2023. A use-after-free condition existed in NotifyOnHistoryReload where a LoadingSessionHistoryEntry object was freed and a reference to that object remained. This resulted in a potentially exploitable condition when the reference to that object was later reused. This vulnerability affects Firefox < 115.
When was CVE-2023-37209 disclosed?
CVE-2023-37209 was first published in the National Vulnerability Database on July 5, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-37209 actively exploited?
CVE-2023-37209 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 53.8% of all scored CVEs.
What is the CVSS score of CVE-2023-37209?
CVE-2023-37209 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-37209?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-37209, 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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