dbcve.org
Firewall FirmwareOperating system · Sophos

CVE-2025-7382

HIGH · 8.8 CVSS v3.1 Published 2025-07-21
Fix available
A fix is available. Upgrade to 21.0.2 or later.
See remediation →
93/100
Remediation priority · Urgent
No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A command injection vulnerability in WebAdmin of Sophos Firewall versions older than 21.0 MR2 (21.0.2) can lead to adjacent attackers achieving pre-auth code execution on High Availability (HA) auxiliary devices, if OTP authentication for the admin user is enabled.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A command injection vulnerability exists in the WebAdmin interface of Sophos Firewall versions prior to 21.0 MR2 (21.0.2). Adjacent network attackers can achieve pre-authentication code execution on High Availability (HA) auxiliary devices, specifically when One-Time Password (OTP) authentication is enabled for the admin user account.

MitigationUpgrade Sophos Firewall to version 21.0 MR2 (21.0.2) or later. If immediate patching is not feasible, restrict network access to the WebAdmin interface and review admin user OTP configurations.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Firewall FirmwareOperating system
Affected:< 21.0.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify Sophos Firewall firmware version
    Access the WebAdmin interface and navigate to System > Administration > Firmware or use the 'version' command in the console. Compare the installed firmware version against 21.0.2.
    Affected if The installed firmware version is less than 21.0.2 (e.g., 21.0.1, 20.0.x, older MR releases).
  2. Identify if High Availability is configured
    In the WebAdmin interface, go to System > High Availability to determine if HA is enabled. Check whether this device is configured as a primary or auxiliary HA node.
    Affected if High Availability is configured and this is an auxiliary (secondary) HA device.
  3. Confirm OTP authentication is enabled for admin account
    In the WebAdmin interface, navigate to Administration > Admin Users > Admin Settings or the OTP configuration section. Verify whether One-Time Password (OTP) authentication is enabled for the admin user account.
    Affected if OTP authentication is enabled for the admin user account.
  4. Assess WebAdmin interface network exposure
    Check firewall rules or interface bindings to determine if the WebAdmin interface (typically ports 443/tcp, 4444/tcp) is accessible from untrusted or adjacent network segments.
    Affected if The WebAdmin interface is accessible from adjacent network segments without proper access restrictions.

A system is affected if it runs Sophos Firewall firmware below 21.0.2, has High Availability configured with an auxiliary device, and has OTP authentication enabled for the admin account, with the WebAdmin interface exposed to adjacent network attackers.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 21.0.2 or later
Fixed in 21.0.2
Interim mitigation

Upgrade Sophos Firewall to version 21.0 MR2 (21.0.2) or later. If immediate patching is not feasible, restrict network access to the WebAdmin interface and review admin user OTP configurations.

Recommended fix High confidence

21.0.2 or later (21.0 MR2)

  1. Identify the current Sophos Firewall firmware version via WebAdmin or CLI
  2. Download Sophos Firewall firmware version 21.0.2 or later from the Sophos support portal
  3. Review Sophos upgrade documentation and release notes before proceeding
  4. Upload the new firmware through WebAdmin (System > Administration > Firmware) or via CLI
  5. Apply the firmware upgrade and verify the system boots successfully
  6. Confirm the new version is installed and WebAdmin is functioning correctly
Caveat Firmware upgrades may cause temporary service interruption; review release notes for any configuration or compatibility considerations

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firewall Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-7382 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data