CVE-2021-20487 json
IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware b…
published 2021-05-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7905
- cvss
- 8.0
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.
Patch / fix
- ibm power9_system_firmware fw930.30, fw940.20, fw950.00
- ibm scale-out_lc_system_firmware op940.20
Exploit prediction
0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 8.0 | CVSS:3.0/AV:N/UI:N/I:H/AC:H/PR:H/S:C/A:H/C:H/E:U/RL:O/RC:C |
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| CNA | 3.0 | 8.0 | CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- IBM Power 9 Systems
Classification
- Weakness
-
- CWE-347 Improper Verification of Cryptographic Signature
References
-
ibm.com
/support/pages/node/6455911
vendor-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/197730
vdb-entry, vendor-advisory
Sources
- CVE List CVE-2021-20487
- NVD CVE-2021-20487
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