CVE-2023-33221
CWE-122Published: December 15, 2023· Updated: Jun 17, 2026
Official Description
When reading DesFire keys, the function that reads the card isn't properly checking the boundaries when copying
internally the data received. This allows a heap based buffer overflow that could lead to a potential Remote Code
Execution on the targeted device. This is especially problematic if you use Default DESFire key.
Risk Analysis
A heap-based buffer overflow exists in Idemia Sigma devices when reading DesFire keys, potentially leading to remote code execution. The risk is particularly high if default keys are utilized.
No public exploit is known, and it is not in the KEV database. The vulnerability is remotely exploitable with low complexity.
Update the firmware to the latest version and ensure that default DesFire keys are changed to secure, unique values.
Technical Analysis
CVE-2023-33221 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.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (2)
Quick Facts
Related CVEs (CWE-122)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-33221 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts