CVE-2021-27562

CRITICALNVD 5.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 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: 3.1%CVSS: 5.5Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an overwrite of secure data, or the printing out of secure data when calling secure functions under the NSPE handler mode.

CVSS v3
5.5
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 or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.1%
EPSS %ILE
87th
KEV
⚠ Exploited

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

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

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

May 25, 2021

Last Modified

June 5, 2026

Advisory Details (2)

Auto-updated Jun 13, 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-2021-27562
generic

Arm Product Security Center

https://developer.arm.com/support/arm-security-updates

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 59× in last 7d / 267× 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 1,097 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-27562?
CVE-2021-27562 is a critical vulnerability published on May 25, 2021. In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an overwrite of secure data, or the printing out of secure data when calling secure functions under the NSPE handler mode.
When was CVE-2021-27562 disclosed?
CVE-2021-27562 was first published on May 25, 2021, with the most recent update on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-27562 actively exploited?
Yes. CISA added CVE-2021-27562 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Arm Trusted Firmware. 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-2021-27562?
CVE-2021-27562 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2021-27562?
CVE-2021-27562 affects Arm Trusted Firmware.
How do I remediate CVE-2021-27562?
A fix for CVE-2021-27562 is available: update to the fixed version the vendor names in its advisory.

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