Medium severity4.2NVD Advisory· Published Jun 6, 2021· Updated Jun 17, 2026
CVE-2021-33881
CVE-2021-33881
Description
On NXP MIFARE Ultralight and NTAG cards, an attacker can interrupt a write operation (aka conduct a "tear off" attack) over RFID to bypass a Monotonic Counter protection mechanism. The impact depends on how the anti tear-off feature is used in specific applications such as public transportation, physical access control, etc.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
11- cpe:2.3:o:nxp:mifare_ultralight_c_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:mifare_ultralight_ev1_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:mifare_ultralight_nano_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:ntag_210_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:ntag_212_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:ntag_213_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:ntag_215_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:nxp:ntag_216_firmware:-:*:*:*:*:*:*:*
- NXP/MIFARE Ultralight and NTAG cardsdescription
Patches
Vulnerability mechanics
References
4- www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/nvdExploitThird Party Advisory
- blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.htmlnvdMitigationThird Party Advisory
- www.nxp.com/docs/en/application-note/AN11340.pdfnvdVendor Advisory
- www.nxp.com/docs/en/application-note/AN13089.pdfnvdVendor Advisory
News mentions
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