Is CVE-2021-36357 actively exploited?

No active exploitation of CVE-2021-36357 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-36357 be exploited remotely?

Yes. CVE-2021-36357 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-36357?

CVE-2021-36357 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-36357

CRITICAL

CVE-2021-36357

CWE-681Published: October 22, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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. The fix is to use the right endian conversion function.

NVD Source

Technical Analysis

CVE-2021-36357 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.