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KiloApplication · Kilo Project

CVE-2020-20335

HIGH · 7.5 CVSS v3.1 Published 2023-06-20
Fix available
A fix is available. Upgrade to 2020-07-02 or later.
See remediation →
84/100
Remediation priority · High
Public exploit 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
Buffer Overflow vulnerability in Antirez Kilo before commit 7709a04ae8520c5b04d261616098cebf742f5a23 allows a remote attacker to cause a denial of service via the editorUpdateRow function in kilo.c.

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
How this class of weakness works · CWE-190

An arithmetic operation produces a value too large for its type and wraps around to an unexpected — often tiny or negative — number. That miscalculated value then drives a memory allocation or a bounds check, opening the door to corruption. The fix is checked arithmetic and validating sizes before they're used.

General guidance for the integer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
KiloApplication
Affected:< 2020-07-02

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
None
Availability
High

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

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 · scoped
Upgrade available Upgrade to 2020-07-02 or later
Fixed in 2020-07-02
Recommended fix Moderate confidence

Code after commit 7709a04ae8520c5b04d261616098cebf742f5a23 (any version post-July 2020)

  1. 1. Identify the current version of Kilo in use by checking the git commit or source version
  2. 2. Navigate to the Kilo repository at github.com/antirez/kilo
  3. 3. Verify the current HEAD commit is after 7709a04ae8520c5b04d261616098cebf742f5a23, which contains the fix for the integer overflow in editorUpdateRow
  4. 4. If the current version is before the fix commit, pull the latest code or checkout a commit hash after 7709a04ae8520c5b04d261616098cebf742f5a23
  5. 5. Rebuild and redeploy the Kilo binary with the patched code
  6. 6. Test that the editorUpdateRow function handles large inputs correctly without crashing

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

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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-2020-20335 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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