CVEvulnerability
CVE-2021-33881
4.2 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-06-06
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.2 MEDIUM — CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS 2.0 ([email protected])
- 1.9 LOW — AV:L/AC:M/Au:N/C:N/I:P/A:N
- Weaknesses
- CWE-863
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.
Affected configurations
• nxp mifare ultralight ev1 firmware
• nxp mifare ultralight c 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
Related
Weakness · CWE (1)
- CWE-863 Incorrect Authorization weakness
References
- https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html Mitigation, Third Party Advisory
- https://www.nxp.com/docs/en/application-note/AN11340.pdf Vendor Advisory
- https://www.nxp.com/docs/en/application-note/AN13089.pdf Vendor Advisory
- https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/ Exploit, Third Party Advisory
- https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html Mitigation, Third Party Advisory
- https://www.nxp.com/docs/en/application-note/AN11340.pdf Vendor Advisory
- https://www.nxp.com/docs/en/application-note/AN13089.pdf Vendor Advisory
- https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/ Exploit, Third Party Advisory