CVE-2021-47781
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 · uneditedCmder Console Emulator 1.3.18 contains a buffer overflow vulnerability that allows attackers to trigger a denial of service condition through a maliciously crafted .cmd file. Attackers can create a specially constructed .cmd file with repeated characters to overwhelm the console emulator's buffer and crash the application.
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 confidenceBuffer overflow vulnerability in Cmder Console Emulator 1.3.18 allows attackers to craft malicious .cmd files containing repeated characters that overflow the console emulator's buffer when executed, causing application crash (denial of service).
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- 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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Identify Cmder versionOpen Cmder and run 'cmder --version' or check the About/Help section in the GUI. Alternatively, check the file properties of the Cmder executable (cmder.exe or Cmder.exe)Affected if The installed version is exactly 1.3.18 or falls within the vulnerable range ending at 1.3.18
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Determine if .cmd file execution is permittedInspect Cmder's execution policy or aliases that may run .cmd files. Check if users commonly execute batch files from untrusted sources within CmderAffected if Users have the ability to execute .cmd files from potentially untrusted sources within the Cmder environment
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Review recent Cmder crash logsCheck Windows Event Viewer Application logs for recent crashes specifically tied to Cmder (Cmder.exe) occurring after executing .cmd filesAffected if There are recent crash events in Event Viewer associated with Cmder after .cmd file execution
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Check for suspicious .cmd filesLocate any recently created or modified .cmd files in user-accessible directories, particularly those containing unusually long sequences of repeated characters in their contentAffected if Malicious .cmd files with buffer-overflow-inducing content (repeated characters) are present and have been executed
A defender is affected if Cmder version 1.3.18 is installed AND users can execute .cmd files from potentially untrusted sources within the Cmder environment.
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 dataUpgrade to a patched version of Cmder if available; avoid opening untrusted .cmd files from unknown sources; run Cmder in a sandboxed environment to limit blast radius.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-47781 — 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-2021-47781 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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- 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