CVE-2021-29133Public exploit

Root-only file disclosure via unchecked script path

Published Mar 24, 2021 · Updated Aug 3, 2024

Arbitrary file read in Alpine Linux Configuration Framework's haserl before 0.9.36 allows local users to read root-only files. The setuid-root executable accepts an attacker-chosen file as its CGI script and emits its contents without verifying the caller's read access. Local command execution is required, and the consequence is confined to disclosure of filesystem data available to the haserl process.

CVSS severity5.5
Medium
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file read in Alpine Linux Configuration Framework's haserl before 0.9.36 allows local users to read root-only files. The setuid-root executable accepts an attacker-chosen file as its CGI script and emits its contents without verifying the caller's read access. Local command execution is required, and the consequence is confined to disclosure of filesystem data available to the haserl process.

The record

CVE
CVE-2021-29133
Published
Mar 24, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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.

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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 exploitPublished

Weakness, pattern, technique

T1005Data from Local System

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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