CVE-2023-7152
CWE-416Published: December 29, 2023· Updated: Jun 17, 2026
Official 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.
Risk Analysis
MicroPython versions 1.21.0 and 1.22.0-preview are affected by a use-after-free vulnerability in the poll_set_add_fd function. This critical flaw is remotely exploitable and carries a CVSS score of 9.8.
Public exploit information exists, but the vulnerability is not currently in the CISA KEV catalog.
Apply the specific patch identified as 8b24aa36ba978eafc6114b6798b47b7bfecdca26 to resolve the issue.
Technical Analysis
CVE-2023-7152 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (14)
Quick Facts
Related CVEs (CWE-416)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-7152 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts