CVE-2025-61661

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2025-11-18. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 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 GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

November 18, 2025

Last Modified

September 1, 2026

Advisory Details (3)

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

oss-security - [SECURITY PATCH 7/8] commands/usbtest: Use correct string length field

http://www.openwall.com/lists/oss-security/2025/11/18/8
redhat

2413827 – (CVE-2025-61661) CVE-2025-61661 grub2: grub2: Out-of-bounds write via malicious USB device

https://bugzilla.redhat.com/show_bug.cgi?id=2413827
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2025-61661

Vendor Advisories for CVE-2025-61661(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
grub22.04-20 ... 2.14~git20250718.0e36779-2 (68 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
grub22.06-13 ... 2.14~git20250718.0e36779-2 (36 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
grub22.12-9 ... 2.14~git20250718.0e36779-2 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
grub22.12-9, 2.12-9+hurd.1, 2.14~git20250718.0e36779-1, 2.14~git20250718.0e36779-22.14-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 40× 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 188 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2025-61661?
CVE-2025-61661 is a medium vulnerability published on November 18, 2025. A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a…
When was CVE-2025-61661 disclosed?
CVE-2025-61661 was first published in the National Vulnerability Database on November 18, 2025, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-61661 actively exploited?
CVE-2025-61661 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 90.6% of all scored CVEs.
What is the CVSS score of CVE-2025-61661?
CVE-2025-61661 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2025-61661?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-61661, 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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