Umbrella Secure Web GatewayApplication · Cisco
CVE-2022-20738
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 · uneditedA vulnerability in the Cisco Umbrella Secure Web Gateway service could allow an unauthenticated, remote attacker to bypass the file inspection feature. This vulnerability is due to insufficient restrictions in the file inspection feature. An attacker could exploit this vulnerability by downloading a crafted payload through specific methods. A successful exploit could allow the attacker to bypass file inspection protections and download a malicious payload.
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 confidenceCisco Umbrella Secure Web Gateway contains a file inspection bypass vulnerability where insufficient restrictions allow a remote, unauthenticated attacker to download malicious payloads without triggering file inspection. The attacker uses crafted payloads delivered through specific methods to circumvent security controls.
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
Umbrella Secure Web GatewayApplication
all versionsCVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/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 checksWork through these to decide whether this CVE applies to you.
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Confirm Cisco Umbrella Secure Web Gateway is in useReview your Cisco Umbrella dashboard or documentation to verify the Secure Web Gateway (SWG) feature is active for your organizationAffected if Secure Web Gateway is enabled and processing web traffic
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Verify file inspection is enabled in policyLog into the Umbrella dashboard, navigate to Policies > Security Settings, and confirm the File Inspection or File Analysis feature is turned on for your active policiesAffected if File inspection is disabled or not configured for the policy applied to user traffic
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Review traffic logs for anomalous downloadsIn the Umbrella dashboard, go to Activity Search or Logs and look for downloads that completed without a corresponding file inspection verdict or blocking action, especially for executable or script file typesAffected if Downloads appear in logs without file inspection metadata or verdicts
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Test file inspection with a safe sampleUse Cisco's recommended policy testing procedure to attempt downloading a known safe test file (such as the Eicar test file) through the Umbrella proxy and verify it receives a file inspection verdictAffected if The test file download completes without triggering any file inspection verdict or is not blocked when it should be
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Check for signs of bypass in recent logsReview Umbrella logs for any patterns where downloads succeeded despite matching file-based threat signatures or policies that should have blocked themAffected if Malicious or suspicious file types were downloaded without being flagged or blocked by file inspection
Your environment is affected if you use Cisco Umbrella Secure Web Gateway and file inspection is either disabled, not returning verdicts for downloads, or allowing suspicious files that should be blocked.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataContact Cisco support to confirm the vulnerability has been patched on the Umbrella platform, and verify file inspection is functioning correctly through policy testing and log review.
Fix this in Umbrella Secure Web Gateway
Scoped from the published advisory
- Consultation3.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,072.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-20738 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-20738 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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
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