CVE-2021-27463
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 has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected applications utilize persistent cookies where the session cookie attribute is not properly invalidated, allowing an attacker to intercept the cookies and gain access to sensitive information.
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 confidenceThe vulnerability exists in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer where persistent cookies are used with improper session cookie attribute invalidation. Attackers can intercept these cookies to gain access to sensitive information due to the lack of secure cookie handling.
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 dataall versionsall versionsall versionsall 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
- 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 checksWork through these to decide whether this CVE applies to you.
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Identify the installed firmware modelAccess the device admin interface or system information page and locate the firmware designation. Look for the specific model identifier (Xegp, Xegk, Xefd, or Xexf) in the firmware version or product name field.Affected if The firmware model is one of: Xegp, Xegk, Xefd, or Xexf - all of these models with any version number are affected by this vulnerability.
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Verify persistent cookie behaviorLog into the web interface, then close the browser without logging out. Reopen the browser and navigate to the login page. Observe whether you remain authenticated or are required to log in again.Affected if Authentication persists after browser closure, indicating persistent cookies are being used and may not be properly invalidated.
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Inspect cookie security attributesUsing browser developer tools (F12), go to the Application or Storage tab and examine the cookies set by the device. Check if the 'Secure' flag is present and if the 'SameSite' attribute is configured.Affected if Cookies lack the Secure flag or have SameSite set to None or omitted entirely, indicating improper session cookie handling.
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Check cookie expiration settingsIn browser developer tools, examine the cookie expiration date or Max-Age attribute. Look for cookies that have a future expiration date rather than being session-scoped.Affected if Cookies have an explicit future expiration date, confirming they are persistent rather than session-only.
If the device runs Emerson X-Stream Enhanced firmware (Xegp, Xegk, Xefd, or Xexf) and uses persistent cookies without proper secure attributes, the environment is affected by this CVE.
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 dataImplement proper session cookie lifecycle management including secure attribute settings, explicit expiration, and server-side invalidation mechanisms for persistent cookies.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-27463 — 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-2021-27463 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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