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FortimailApplication · Fortinet

CVE-2020-15933

MEDIUM · 5.3 CVSS v3.1 Published 2022-01-05
Fix available
A fix is available. Upgrade to after 6.0.9 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click Patch available

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 exposure of sensitive information to an unauthorized actor in Fortinet FortiMail versions 6.0.9 and below, FortiMail versions 6.2.4 and below FortiMail versions 6.4.1 and 6.4.0 allows attacker to obtain potentially sensitive software-version information via client-side resources inspection.

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
How this class of weakness works · CWE-200

The application discloses data — error detail, internal paths, tokens, or other users' records — to someone who shouldn't see it. On its own it can look minor, but it hands attackers the map they need for a larger attack. Remediation is about minimising what's returned and enforcing authorization on every piece of data.

General guidance for the information exposure class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
FortimailApplication
Affected:<= 6.0.9= 6.2.0= 6.2.1= 6.2.2= 6.2.3= 6.2.4= 6.4.0= 6.4.1

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

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 6.0.9
Vendor patch fortiguard.com →
Recommended fix Moderate confidence

FortiMail 6.0.10+ (if on 6.0.x); FortiMail 6.2.5+ (if on 6.2.x); FortiMail 6.4.2+ (if on 6.4.x)

  1. Identify the current FortiMail version using the web UI (System > Status) or CLI: 'get system status'
  2. Determine which release branch is in use (6.0.x, 6.2.x, or 6.4.x)
  3. For FortiMail 6.0.x deployments: Upgrade to FortiMail 6.0.10 or later (6.0.10 contains the fix for this vulnerability)
  4. For FortiMail 6.2.x deployments: Upgrade to FortiMail 6.2.5 or later (6.2.5 and above contain the fix)
  5. For FortiMail 6.4.x deployments: Upgrade to FortiMail 6.4.2 or later (6.4.2 and above contain the fix)
  6. After upgrade, verify the version with 'get system status' to confirm the patch was applied
  7. Review client-accessible web pages (MTA, webmail, admin UI) to confirm sensitive version information is no longer exposed in client-side resources
Caveat Review FortiMail release notes for the target version to check for configuration or behavioral changes between current and target version; test upgrade in staging environment first

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

We can identify the exact fixed release, upgrade, and verify it in staging — typical engagement from $900. Get the upgrade done

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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-2020-15933 in production — separate from our analysis above.

No notes yet

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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
  • Verified mitigations, workarounds, and config changes
  • 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