CVE-2021-42775Network attack vector

Unauthenticated arbitrary file overwrite via firmware download

Published Nov 12, 2021 · Updated Aug 4, 2024

Arbitrary file write in Broadcom Emulex HBA Manager/One Command Manager before 11.4.425.0 and 12.8.542.31 lets remote attackers replace host files. The remote firmware-download feature places or replaces a file at an arbitrary location on the managed host, although Broadcom has not disclosed the responsible function or failed validation. Strictly Local Management mode prevents remote reachability; non-secure remote-management mode requires no authentication and permits host-file modification.

CVSS severity9.1
Critical
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in Broadcom Emulex HBA Manager/One Command Manager before 11.4.425.0 and 12.8.542.31 lets remote attackers replace host files. The remote firmware-download feature places or replaces a file at an arbitrary location on the managed host, although Broadcom has not disclosed the responsible function or failed validation. Strictly Local Management mode prevents remote reachability; non-secure remote-management mode requires no authentication and permits host-file modification.

The record

CVE
CVE-2021-42775
Published
Nov 12, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1105
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
6.4NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1105Ingress Tool Transfer

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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