CVE-2022-25299Public exploitNetwork attack vector

Arbitrary file write via upload path traversal

Published Feb 18, 2022 · Updated Sep 16, 2024

Path traversal in Cesanta Mongoose before 7.6 allows remote attackers to write files outside the configured upload directory. mg_http_upload joins the name query parameter directly to the caller-supplied directory and passes the path to fopen without removing parent-directory segments. The application must expose an HTTP handler that invokes this helper; writes remain limited to locations writable by the server process.

CVSS severity7.5
High
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in Cesanta Mongoose before 7.6 allows remote attackers to write files outside the configured upload directory. mg_http_upload joins the name query parameter directly to the caller-supplied directory and passes the path to fopen without removing parent-directory segments. The application must expose an HTTP handler that invokes this helper; writes remain limited to locations writable by the server process.

The record

CVE
CVE-2022-25299
Published
Feb 18, 2022
Updated
Sep 16, 2024
Vendor
Cesanta
Product
Mongoose
Classifications
CWE-552, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cesanta · Mongooseversion=unspecified <7.6

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
9.8SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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-552Files or Directories Accessible to External Parties
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo