CVE-2025-61663

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreMEDIUM confidence

Score 4.9 from GitHub Security Advisory published 2025-11-18. NVD baseline CVSS 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.9Exploit: NoneExposed: 0

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

A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.

CVSS v3
4.9
EG Score
4.9(medium)
EG Risk
—
EPSS
2.7%
KEV
Not listed

Published

November 18, 2025

Last Modified

June 30, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
redhat

2414684 – (CVE-2025-61663) CVE-2025-61663 grub2: Missing unregister call for normal commands may lead to use-after-free

https://bugzilla.redhat.com/show_bug.cgi?id=2414684
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2025-61663

Vendor Advisories for CVE-2025-61663(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 35× 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 104 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
  4. 2026-07-19 14:30 UTCEPSS rescore
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  15. 2026-07-11 08:27 UTCEPSS rescore
  16. 2026-07-10 01:45 UTCOSV refresh
  17. 2026-07-09 19:09 UTCEPSS rescore
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  20. 2026-07-06 16:27 UTCEPSS rescore
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  1. 2026-07-04 06:31 UTCEPSS rescore
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  3. 2026-06-30 23:22 UTCEPSS rescore
  4. 2026-06-28 14:07 UTCEPSS rescore
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  6. 2026-06-28 04:56 UTCEPSS rescore
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  9. 2026-06-23 21:32 UTCEPSS rescore
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  11. 2026-06-21 14:56 UTCEPSS rescore
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  21. 2026-06-15 17:48 UTCEPSS rescore
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  23. 2026-06-14 23:18 UTCEPSS rescore
  24. 2026-06-13 23:00 UTCEPSS rescore
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  26. 2026-06-12 23:11 UTCEPSS rescore
  27. 2026-06-11 14:00 UTCEPSS rescore
  28. 2026-06-10 22:18 UTCEPSS rescore
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  30. 2026-06-10 13:22 UTCEPSS rescore
  31. 2026-06-08 14:17 UTCEPSS rescore
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  33. 2026-06-07 15:24 UTCEPSS rescore
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  35. 2026-06-06 13:47 UTCEPSS rescore
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  37. 2026-06-05 22:46 UTCEPSS rescore
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  39. 2026-06-05 06:10 UTCEPSS rescore
  40. 2026-06-05 06:10 UTCEPSS rescore
  41. 2026-06-04 13:12 UTCEPSS rescore
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  43. 2026-06-02 20:13 UTCEPSS rescore
  44. 2026-06-02 20:12 UTCEPSS rescore
  45. 2026-06-01 13:51 UTCEPSS rescore
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  47. 2026-05-31 22:30 UTCEPSS rescore
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  49. 2026-05-31 00:16 UTCEPSS rescore
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  51. 2026-05-29 13:44 UTCEPSS rescore
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  65. 2026-05-23 15:21 UTCEPSS rescore
  66. 2026-05-22 21:16 UTCEPSS rescore
  67. 2026-05-22 21:16 UTCEPSS rescore
  68. 2026-05-21 22:43 UTCEPSS rescore
  69. 2026-05-21 04:32 UTCEG score recompute
  70. 2026-05-21 04:32 UTCVendor advisory
  71. 2026-05-21 04:31 UTCGHSA enrichment
  72. 2026-05-20 22:37 UTCEPSS rescore
  73. 2026-05-20 22:37 UTCEPSS rescore
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  75. 2026-05-20 22:37 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-61663?
CVE-2025-61663 is a medium vulnerability published on November 18, 2025. A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this…
When was CVE-2025-61663 disclosed?
CVE-2025-61663 was first published in the National Vulnerability Database on November 18, 2025, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-61663 actively exploited?
CVE-2025-61663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-61663?
CVE-2025-61663 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2025-61663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-61663, 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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