CVE-2025-4093

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 65% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

April 29, 2025

Last Modified

April 13, 2026

Advisory Details (4)

Auto-updated Sep 19, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4172-1] firefox-esr security update

https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html
generic

Security Vulnerabilities fixed in Thunderbird 128.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-32/
generic

Security Vulnerabilities fixed in Firefox ESR 128.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-29/
generic

1894100 - (CVE-2025-4093) Poison crash in [@ mozilla::widget::WaylandBuffer::BufferReleaseCallbackHandler]

https://bugzilla.mozilla.org/show_bug.cgi?id=1894100

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:128.12.0+build1-0ubuntu0.22.04.1) @ jammy2026-05-21ubuntu
redhatthunderbird-0:128.10.0-1.el8_82025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_22025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_42025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_22025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_42025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_02025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_62025-05-15redhat
redhatfirefox-0:128.10.0-1.el8_82025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_42025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_62025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_22025-05-14redhat
redhatfirefox-0:128.10.0-1.el9_62025-05-13redhat
redhatthunderbird-0:128.10.0-1.el10_02025-05-13redhat
redhatfirefox-0:128.10.0-1.el10_02025-05-13redhat
redhatthunderbird-0:128.10.0-1.el8_102025-05-12redhat
redhatfirefox-0:128.10.0-1.el9_42025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_02025-05-08redhat
redhatfirefox-0:128.10.0-1.el7_92025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_22025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_52025-05-05redhat
redhatthunderbird-0:128.10.0-1.el9_52025-05-05redhat
redhatfirefox-0:128.10.0-1.el8_102025-05-05redhat

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

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (208 versions)128.10.1esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (250 versions)1:128.10.1esr-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 128.9.0esr-2 (112 versions)128.10.0esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:128.9.0esr-1~deb12u1 (132 versions)1:128.10.0esr-1~deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—128.10.0esr-1—
thunderbird—1:128.10.0esr-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—128.10.0esr-1—
thunderbird—1:128.10.0esr-1—

Weakness Classification(1)

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

All Vendor Advisories

(23)

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 / 30× 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 193 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:29 UTCEPSS rescore
  4. 2026-09-17 01:50 UTCOSV refresh
  5. 2026-09-16 14:07 UTCEPSS rescore
  6. 2026-09-15 03:09 UTCEPSS rescore
  7. 2026-09-12 15:00 UTCEPSS rescore
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-11 09:36 UTCEPSS rescore
  10. 2026-09-10 09:34 UTCEPSS rescore
  11. 2026-09-08 21:59 UTCEPSS rescore
  12. 2026-09-07 16:00 UTCEPSS rescore
  13. 2026-09-07 16:00 UTCEPSS rescore
  14. 2026-09-06 13:46 UTCEPSS rescore
  15. 2026-09-05 15:28 UTCEPSS rescore
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-02 14:11 UTCEPSS rescore
  18. 2026-09-01 13:53 UTCEPSS rescore
  19. 2026-09-01 04:38 UTCEPSS rescore
  20. 2026-08-30 19:16 UTCEPSS rescore
  21. 2026-08-30 01:21 UTCEPSS rescore
  22. 2026-08-29 02:13 UTCOSV refresh
  23. 2026-08-28 21:40 UTCEPSS rescore
  24. 2026-08-27 14:24 UTCEPSS rescore
  25. 2026-08-26 14:45 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-24 14:16 UTCEPSS rescore
  3. 2026-08-24 09:22 UTCEPSS rescore
  4. 2026-08-23 00:18 UTCEPSS rescore
  5. 2026-08-21 23:48 UTCEPSS rescore
  6. 2026-08-20 22:54 UTCEPSS rescore
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-18 13:47 UTCEPSS rescore
  9. 2026-08-17 13:46 UTCEPSS rescore
  10. 2026-08-16 14:55 UTCEPSS rescore
  11. 2026-08-16 02:13 UTCEPSS rescore
  12. 2026-08-15 01:29 UTCEPSS rescore
  13. 2026-08-13 21:59 UTCEPSS rescore
  14. 2026-08-12 14:13 UTCOSV refresh
  15. 2026-08-12 13:50 UTCEPSS rescore
  16. 2026-08-11 13:41 UTCEPSS rescore
  17. 2026-08-10 23:59 UTCEPSS rescore
  18. 2026-08-09 13:46 UTCEPSS rescore
  19. 2026-08-08 16:36 UTCEPSS rescore
  20. 2026-08-06 13:46 UTCEPSS rescore
  21. 2026-08-05 19:16 UTCEPSS rescore
  22. 2026-08-04 15:09 UTCEPSS rescore
  23. 2026-08-04 10:37 UTCEPSS rescore
  24. 2026-08-03 10:35 UTCEPSS rescore
  25. 2026-08-02 02:26 UTCEPSS rescore
  26. 2026-08-01 04:15 UTCEPSS rescore
  27. 2026-07-30 16:27 UTCEPSS rescore
  28. 2026-07-30 01:30 UTCEPSS rescore
  29. 2026-07-30 01:30 UTCEPSS rescore
  30. 2026-07-28 15:35 UTCEPSS rescore
  31. 2026-07-27 21:24 UTCOSV refresh
  32. 2026-07-26 14:54 UTCEPSS rescore
  33. 2026-07-25 14:17 UTCEPSS rescore
  34. 2026-07-25 14:17 UTCEPSS rescore
  35. 2026-07-24 14:17 UTCEPSS rescore
  36. 2026-07-23 14:18 UTCEPSS rescore
  37. 2026-07-23 02:55 UTCEG score recompute▲ 1.60
  38. 2026-07-22 14:07 UTCEPSS rescore
  39. 2026-07-22 14:07 UTCEPSS rescore
  40. 2026-07-21 15:24 UTCEPSS rescore
  41. 2026-07-20 17:07 UTCEPSS rescore
  42. 2026-07-19 14:30 UTCEPSS rescore
  43. 2026-07-19 14:30 UTCEPSS rescore
  44. 2026-07-19 02:28 UTCEPSS rescore
  45. 2026-07-19 02:28 UTCEPSS rescore
  46. 2026-07-18 10:04 UTCEPSS rescore
  47. 2026-07-16 17:02 UTCEPSS rescore
  48. 2026-07-16 17:02 UTCEPSS rescore
  49. 2026-07-15 16:57 UTCEPSS rescore
  50. 2026-07-15 16:57 UTCEPSS rescore
  51. 2026-07-15 01:59 UTCEPSS rescore
  52. 2026-07-15 01:59 UTCEPSS rescore
  53. 2026-07-13 22:29 UTCEPSS rescore
  54. 2026-07-13 22:29 UTCEPSS rescore
  55. 2026-07-13 06:12 UTCEPSS rescore
  56. 2026-07-12 05:46 UTCEPSS rescore
  57. 2026-07-11 08:27 UTCEPSS rescore
  58. 2026-07-11 08:27 UTCEPSS rescore
  59. 2026-07-10 13:41 UTCOSV refresh
  60. 2026-07-09 19:09 UTCEPSS rescore
  61. 2026-07-09 19:09 UTCEPSS rescore
  62. 2026-07-08 15:15 UTCEPSS rescore
  63. 2026-07-07 13:45 UTCEPSS rescore
  64. 2026-07-06 16:27 UTCEPSS rescore
  65. 2026-07-06 16:27 UTCEPSS rescore
  66. 2026-07-06 02:23 UTCEPSS rescore
  67. 2026-07-06 02:23 UTCEPSS rescore
  68. 2026-07-05 02:30 UTCEPSS rescore
  69. 2026-07-04 06:30 UTCEPSS rescore
  70. 2026-07-02 17:01 UTCEPSS rescore
  71. 2026-07-01 15:06 UTCEPSS rescore
  72. 2026-06-30 23:22 UTCEPSS rescore
  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-29 14:06 UTCEPSS rescore
  75. 2026-06-29 14:06 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-4093?
CVE-2025-4093 is a high vulnerability published on April 29, 2025. Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10.
When was CVE-2025-4093 disclosed?
CVE-2025-4093 was first published in the National Vulnerability Database on April 29, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-4093 actively exploited?
CVE-2025-4093 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.7% of all scored CVEs.
What is the CVSS score of CVE-2025-4093?
CVE-2025-4093 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2025-4093?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-4093, 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.

Dependency Blast Radius

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