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MinttyApplication · Mintty Project

CVE-2021-31701

HIGH · 7.5 CVSS v3.1 Published 2021-06-06
Fix available
A fix is available. Upgrade to 3.4.7 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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
Mintty before 3.4.7 mishandles Bracketed Paste Mode.

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 confidence

Mintty (a terminal emulator for Cygwin/MSYS2) before version 3.4.7 contains a vulnerability in its handling of Bracketed Paste Mode, a terminal feature that uses escape sequences to distinguish pasted text from typed input. The exact nature of the mishandling is not specified in the available description, but the CVSS 7.5 score indicates a significant security impact.

MitigationUpgrade Mintty to version 3.4.7 or later. Bracketed Paste Mode should be reviewed and tested after the upgrade to ensure proper functionality.

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
MinttyApplication
Affected:< 3.4.7

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
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check installed Mintty version
    Run 'mintty --version' in a Mintty terminal, or right-click the Mintty window title and select 'About' to view the version number
    Affected if The version displayed is lower than 3.4.7 (for example, 3.4.6, 3.4.0, 3.3.0, etc.)
  2. Verify Bracketed Paste Mode status
    In the Mintty terminal, run the command 'printf "\033[?2004h"; echo "BPM enabled"' to enable Bracketed Paste Mode, then test pasting text. Alternatively, check if options for paste mode are enabled in Mintty settings (Options > Paste).
    Affected if Bracketed Paste Mode is enabled or can be activated, since the vulnerability exists in how Mintty handles this mode.
  3. Confirm environment type
    Verify that the terminal in use is Mintty (check the window title or process name). Mintty is commonly used with Cygwin and MSYS2 distributions.
    Affected if The terminal is Mintty running on Cygwin or MSYS2, and the version is below 3.4.7.

You are affected if you are running any version of Mintty earlier than 3.4.7 and Bracketed Paste Mode is enabled or may be triggered in your terminal sessions.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 3.4.7 or later
Fixed in 3.4.7
Interim mitigation

Upgrade Mintty to version 3.4.7 or later. Bracketed Paste Mode should be reviewed and tested after the upgrade to ensure proper functionality.

Fix this in Mintty Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
5.0 hours of engineering $860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.

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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-2021-31701 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