CVE-2024-37273Public exploitNetwork attack vector

Unauthenticated code execution via unrestricted file append

Published Jun 4, 2024 · Updated Feb 13, 2025

Path traversal in Jan 0.4.12 allows remote attackers to execute arbitrary code through the local API's appendFileSync endpoint. The endpoint accepts an attacker-controlled pathname and content for a synchronous file append without restricting traversal outside the intended directory. No authentication or user interaction is required when the API is network-reachable, and writing startup files enables code execution under the Jan process account.

CVSS severity9.8
Critical
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Jan 0.4.12 allows remote attackers to execute arbitrary code through the local API's appendFileSync endpoint. The endpoint accepts an attacker-controlled pathname and content for a synchronous file append without restricting traversal outside the intended directory. No authentication or user interaction is required when the API is network-reachable, and writing startup files enables code execution under the Jan process account.

The record

CVE
CVE-2024-37273
Published
Jun 4, 2024
Updated
Feb 13, 2025
Vendor
Menlo Research Pte. Ltd.
Product
Jan
Classifications
CWE-434, CWE-22, CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v0.4.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Menlo Research Pte. Ltd. · Janversion=v0.4.12

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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