What is CVE-2021-42774?

CVE-2021-42774 is a critical-severity vulnerability in Broadcom Emulex Hba Manager, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-11-12.

How severe is CVE-2021-42774?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Broadcom Emulex Hba Manager

CVE-2021-42774

Broadcom Emulex HBA Manager/One Command Manager versions before 11.4.425.0 and 12.8.542.31, if not installed in Strictly Local Management mode, have a buffer overflow vulnerability in the remote firmware download feature that could allow remote unauthenticated users to perform various attacks. In non-secure mode, the user is unauthenticated.

Vulnerability class: Buffer Overflow

Published 2021-11-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.024 (83.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: +0.001

Affected products

Broadcom Emulex Hba Manager

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.broadcom.com/products/storage/fibre-channel-host-bus-adapters/emulex-hba-ma… (Product)
docs.broadcom.com/doc/elx_HBAManager-Lin-RN12811-101.pdf (Vendor Advisory)

Frequently asked questions

What is CVE-2021-42774?: CVE-2021-42774 is a critical-severity vulnerability in Broadcom Emulex Hba Manager, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-11-12.
How severe is CVE-2021-42774?: Critical severity. CVSS v3 base score is 9.8 out of 10.