CVE-2021-25487

CRITICALNVD 7.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-06-29), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.3 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 0.6%CVSS: 7.3Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

Lack of boundary checking of a buffer in set_skb_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.

CVSS v3
7.3
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 6, 2021

Last Modified

October 30, 2025

Advisory Details (2)

Auto-updated Jun 6, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25487
generic

Samsung Mobile Security

https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=10

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 251× 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 1,050 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-25487?
CVE-2021-25487 is a critical vulnerability published on October 6, 2021. Lack of boundary checking of a buffer in setskbpriv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.
When was CVE-2021-25487 disclosed?
CVE-2021-25487 was first published on October 6, 2021, with the most recent update on October 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-25487 actively exploited?
Yes. CISA added CVE-2021-25487 to the Known Exploited Vulnerabilities catalog on June 29, 2023, affecting Samsung Mobile Devices. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2021-25487?
CVE-2021-25487 has a CVSS v3 base score of 7.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2021-25487?
CVE-2021-25487 affects Samsung Mobile Devices.
How do I remediate CVE-2021-25487?
A fix for CVE-2021-25487 is available: update to the fixed version the vendor names in its advisory.

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