CVSS 3.1
4.2 mediumCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NCVE-2021-33881
Medium (4.2) in nxp. EPSS 0.4% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- nxp:mifare_ultralight_c_firmware
- nxp:mifare_ultralight_ev1_firmware
- nxp:mifare_ultralight_nano_firmware
- nxp:ntag_210_firmware
- nxp:ntag_212_firmware
- nxp:ntag_213_firmware
- nxp:ntag_215_firmware
- nxp:ntag_216_firmware
References
- https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html
- https://www.nxp.com/docs/en/application-note/AN11340.pdf
- https://www.nxp.com/docs/en/application-note/AN13089.pdf
- https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/
- https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html