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SfosOperating system · Sophos

CVE-2022-0331

MEDIUM · 5.3 CVSS v3.1 Published 2022-03-29
Fix available
A fix is available. Upgrade to after 18.5.2 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable 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
An information disclosure vulnerability in Webadmin allows an unauthenticated remote attacker to read the device serial number in Sophos Firewall version v18.5 MR2 and older.

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 · high confidence

An information disclosure vulnerability exists in the Webadmin interface of Sophos Firewall v18.5 MR2 and older that allows unauthenticated remote attackers to read the device serial number. The vulnerability is exploitable over the network without any authentication credentials. The CVSS 5.3 rating indicates network-exploitable access with low confidentiality impact but no integrity or availability impact.

MitigationUpgrade Sophos Firewall to a version newer than v18.5 MR2, or apply the relevant security patch to address the unauthenticated information disclosure in Webadmin.

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
SfosOperating system
Affected:<= 18.5.2

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

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. Determine installed Sophos Firewall version
    Access the Webadmin login page and look for the version number displayed, or use the command line interface (CLI) and run 'version' or 'system info version' to retrieve the firmware version
    Affected if The displayed version is 18.5.2 or lower (including any 18.5 MR2 or older releases)
  2. Confirm Webadmin interface is network-accessible
    Attempt to access the Webadmin URL (typically https://<device-ip>:443) from an untrusted network location, or review firewall rules to determine if TCP port 443 (or 80) is open to untrusted/external networks
    Affected if Webadmin is reachable from networks other than trusted management subnets
  3. Verify serial number is retrievable without authentication
    Send an unauthenticated HTTP request to the Webadmin interface and observe if the device serial number is returned in the response (typically via an API endpoint or login page source)
    Affected if The serial number is visible in the response without providing any login credentials

You are affected if your Sophos Firewall version is 18.5.2 or lower AND the Webadmin interface is exposed to untrusted networks, allowing unauthenticated attackers to retrieve the device serial number.

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 a release after 18.5.2
Interim mitigation

Upgrade Sophos Firewall to a version newer than v18.5 MR2, or apply the relevant security patch to address the unauthenticated information disclosure in Webadmin.

Recommended fix Moderate confidence

v18.5 MR3 or later (Sfos > 18.5.2)

  1. Check the current Sophos Firewall version by logging into the Webadmin interface or using the CLI command 'version'
  2. Identify the appropriate upgrade path for your hardware appliance model
  3. Download the fixed firmware version from Sophos support portal - look for version v18.5 MR3 or later
  4. Upload the firmware through Webadmin: Navigate to Backup & Firmware > Firmware and upload the new image
  5. Schedule a maintenance window as the upgrade will require a reboot
  6. Apply the firmware update and verify the device serial number is no longer accessible without authentication
Caveat Firmware upgrades may cause brief network interruption; ensure you have console access and backup configuration before proceeding

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

Fix this in Sfos Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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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-2022-0331 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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