Cyber Resilience

CVE-2021-36357

Critical

Published: 22 October 2021

Published
22 October 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0020 42.4th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-36357 is a critical-severity Incorrect Conversion between Numeric Types (CWE-681) vulnerability in Openpowerfoundation Skiboot. Its CVSS base score is 9.8 (Critical).

Operationally, ranked at the 42.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

An issue was discovered in OpenPOWER 2.6 firmware. unpack_timestamp() calls le32_to_cpu() for endian conversion of a uint16_t "year" value, resulting in a type mismatch that can truncate a higher integer value to a smaller one, and bypass a timestamp check.…

more

The fix is to use the right endian conversion function.

CWE(s)
CWE-681

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

openpowerfoundation
skiboot
2.6

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References