# CVE-2023-7152: PYSEC-2023-258 - A vulnerability, which was classified as critical, has been found in MicroPython…

Source: https://junglewise.ai/threats/cve-2023-7152-pysec-2023-256-a-vulnerability-which-was-classified-as-critical  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-12-29  
License: CC BY 4.0 with a link back

CVE-2023-7152 · Severity: low · CVSS 3.1 · Published 2023-12-29

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.

Technologies: [micropython-copy (PyPI)](https://junglewise.ai/threats/technologies/micropython-copy), [micropython-io (PyPI)](https://junglewise.ai/threats/technologies/micropython-io). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2023-7152 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-7152 being exploited in the wild.

**How severe is CVE-2023-7152?** Low severity, with a CVSS score of 3.1, published 29 December 2023.

**Which products and versions are affected?** micropython-copy (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0; micropython-io (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0; micropython-os (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0; micropython-select (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0.

**Is there a fix for CVE-2023-7152?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2023-7152?** Check whether you run micropython-copy (PyPI), micropython-io (PyPI), micropython-os (PyPI) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- micropython-copy (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0
- micropython-io (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0
- micropython-os (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0
- micropython-select (PyPI) GIT:introduced=0,fixed=8b24aa36ba978eafc6114b6798b47b7bfecdca26|ECOSYSTEM:introduced=0

## Identifiers

- CVE-2023-7152
- PYSEC-2023-256
- PYSEC-2023-257
- PYSEC-2023-258
- PYSEC-2023-259

## Related threats

- [Use After Free in MicroPython](https://junglewise.ai/threats/cve-2024-8947-use-after-free-in-micropython)
- [Heap-based Buffer Overflow in MicroPython](https://junglewise.ai/threats/cve-2024-8946-heap-based-buffer-overflow-in-micropython)
- [heap-buffer-overflow in MicroPython](https://junglewise.ai/threats/cve-2024-8948-heap-buffer-overflow-in-micropython)