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🛡️ CVE-2023-7152 — micropython

🟡 CVSS 5.5 — Medium ⚠️ Exploit Public CWE-416 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A vulnerability, which was classified as critical, has been found in MicroPython 1.21.0/1.22.0-preview. Affected by this issue is the function poll_set_add_fd of the file extmod/modselect.c. The manipulation leads to use after free. The exploit has been disclosed to the public and may be used. The patch is identified as 8b24aa36ba978eafc6114b6798b47b7bfecdca26. It is recommended to apply a patch to fix this issue. VDB-249158 is the identifier assigned to this vulnerability.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

  • Attack vector: Adjacent network — the attacker has to sit on the same local or logical network.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2023-7152 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2023-7152 is recorded against 5 packages.

  • micropython
  • micropython-copy
  • micropython-io
  • micropython-os
  • micropython-select

Timeline and source

Published on 29 December 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
vuldb.com
vuldb.com
github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
vuldb.com
vuldb.com

Other advisories for this package

micropython has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-416: Use After Free) in other software:

CVE-2023-7152 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CWE CWE-416
Public Exploit ⚠️ Yes
Source NVD
Published 2023-12-29
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
micropython — —
micropython-copy — —
micropython-io — —
micropython-os — —
micropython-select — —

References

Permissions Required, Third Party Advisory, VDB Entry https://vuldb.com/?ctiid.249158
Third Party Advisory, VDB Entry https://vuldb.com/?id.249158
Permissions Required, Third Party Advisory, VDB Entry https://vuldb.com/?ctiid.249158
Third Party Advisory, VDB Entry https://vuldb.com/?id.249158

Exploit Protection

Are you running micropython?

CVE-2023-7152 carries CVSS 5.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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