CVE-2025-8027

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2025-07-22. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
27.6%
KEV
Not listed

Published

July 22, 2025

Last Modified

June 17, 2026

References (9)

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:140.7.1+build1-0ubuntu0.22.04.1) @ jammy2026-05-21ubuntu
redhatthunderbird-0:128.13.0-3.el8_102025-08-12redhat
redhatthunderbird-0:128.13.0-3.el9_22025-08-11redhat
redhatthunderbird-0:128.13.0-3.el9_42025-08-11redhat
redhatthunderbird-0:128.13.0-3.el8_62025-08-11redhat
redhatthunderbird-0:128.13.0-3.el9_02025-08-11redhat
redhatthunderbird-0:128.13.0-3.el8_42025-08-11redhat
redhatthunderbird-0:128.13.0-3.el8_82025-08-11redhat
redhatthunderbird-0:128.13.0-3.el8_22025-08-11redhat
redhatfirefox-0:128.13.0-1.el8_22025-07-31redhat
redhatfirefox-0:128.13.0-1.el8_62025-07-31redhat
redhatfirefox-0:128.13.0-1.el8_82025-07-31redhat
redhatfirefox-0:128.13.0-1.el8_42025-07-30redhat
redhatfirefox-0:128.13.0-1.el7_92025-07-30redhat
redhatfirefox-0:128.13.0-1.el9_22025-07-29redhat
redhatfirefox-0:128.13.0-1.el9_02025-07-29redhat
redhatfirefox-0:128.13.0-1.el9_42025-07-29redhat
redhatthunderbird-0:128.13.0-3.el9_62025-07-29redhat
redhatthunderbird-0:128.13.0-3.el10_02025-07-29redhat
redhatfirefox-0:128.13.0-1.el10_02025-07-28redhat
redhatfirefox-0:128.13.0-1.el9_62025-07-24redhat
redhatfirefox-0:128.13.0-1.el8_102025-07-24redhat

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

(22)

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 11× in last 7d / 45× 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 116 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
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  21. 2026-07-10 08:52 UTCOSV refresh
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  21. 2026-06-22 14:25 UTCEPSS rescore
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  23. 2026-06-21 19:13 UTCOSV refresh
  24. 2026-06-21 14:56 UTCEPSS rescore
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  26. 2026-06-21 01:59 UTCEPSS rescore
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  28. 2026-06-19 19:25 UTCEPSS rescore
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  30. 2026-06-18 17:52 UTCEPSS rescore
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  43. 2026-06-08 14:17 UTCEPSS rescore
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  45. 2026-06-07 15:24 UTCEPSS rescore
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  49. 2026-06-05 22:47 UTCEPSS rescore
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  53. 2026-06-04 13:12 UTCEPSS rescore
  54. 2026-06-04 13:12 UTCEPSS rescore
  55. 2026-06-02 22:40 UTCOSV refresh
  56. 2026-06-02 20:13 UTCEPSS rescore
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  75. 2026-05-26 07:18 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-8027?
CVE-2025-8027 is a medium vulnerability published on July 22, 2025. On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and…
When was CVE-2025-8027 disclosed?
CVE-2025-8027 was first published in the National Vulnerability Database on July 22, 2025, 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-2025-8027 actively exploited?
CVE-2025-8027 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-8027?
CVE-2025-8027 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-8027?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-8027, 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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