CVE-2021-42095
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 · uneditedXshell before 7.0.0.76 allows attackers to cause a crash by triggering rapid changes to the title bar.
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 confidenceXshell before version 7.0.0.76 contains a denial-of-service vulnerability in its title bar rendering/handling code. Attackers can trigger a crash by making rapid changes to the application's title bar, likely due to improper resource management or a race condition in the title update logic.
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< 7.0.0.76CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
-
Verify Xshell is installedCheck for Xshell executable on the system - look in common installation directories such as C:\Program Files\NetSarang\Xshell\ or C:\Program Files (x86)\NetSarang\Xshell\, or search for xshell.exe across the system.Affected if Xshell is not found on the system, meaning the vulnerability does not apply.
-
Determine installed Xshell versionRight-click on the Xshell executable (xshell.exe), select Properties, and view the Details tab to find the Product Version. Alternatively, open Xshell and check Help > About Xshell for the version number.Affected if Unable to determine the version, but Xshell is installed.
-
Compare version to affected rangeCompare the installed version number to 7.0.0.76. Note that versions before 7.0.0.76 (such as 7.0.0.75, 6.x.x.x, etc.) are all affected.Affected if Installed version is less than 7.0.0.76 (for example, 7.0.0.75 or earlier), indicating the system is vulnerable.
-
Confirm Xshell title bar feature is in useThe vulnerability is triggered through rapid title bar changes. This is most relevant if Xshell is being actively used with custom window titles or if external tools/scripts manipulate the window title.Affected if Xshell is running with dynamic or frequently changing window titles, making exploitation possible.
The system is affected if Xshell is installed with a version lower than 7.0.0.76.
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.
dbcve · scoped7.0.0.76
Upgrade Xshell to version 7.0.0.76 or later to obtain the patch for this vulnerability.
7.0.0.76
- Obtain Xshell version 7.0.0.76 or later from the official vendor website (www.netsarang.com)
- Back up any existing Xshell configuration files if desired
- Install the new version of Xshell (7.0.0.76 or later) over the existing installation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42095 — 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-2021-42095 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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
- No spam, self-promotion, credentials, or personal data