CVE-2022-21230

Request-body disclosure via insecure temporary-file permissions

Published May 1, 2022 · Updated Sep 16, 2024

Information exposure in all versions of NanoHttpd NanoHTTPD allows local users to read HTTP request bodies from temporary files. DefaultTempFile writes bodies larger than 1024 bytes to a RandomAccessFile whose permissions permit access by every host user. Exploitation requires local access to the host and exposes only request data handled through this temporary-file path.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in all versions of NanoHttpd NanoHTTPD allows local users to read HTTP request bodies from temporary files. DefaultTempFile writes bodies larger than 1024 bytes to a RandomAccessFile whose permissions permit access by every host user. Exploitation requires local access to the host and exposes only request data handled through this temporary-file path.

The record

CVE
CVE-2022-21230
Published
May 1, 2022
Updated
Sep 16, 2024
Vendor
NanoHttpd
Product
NanoHTTPD
Classifications
CWE-200, CWE-378, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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

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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=0 <unspecified

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

NanoHttpd · NanoHTTPDversion=0 <unspecified

Published CVSS scores

5.5SnykCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-378Creation of Temporary File With Insecure Permissions
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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