VulnerabilityModified
CVE-2021-33881
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.
MEDIUM 4.2EPSS 0.41%
Does this matter?
Lower severity and a low EPSS score (0.41%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.2 MEDIUMCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.41% probability · 35th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- 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
- Source
- cve@mitre.org
References
- https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.htmlMitigation, Third Party Advisory
- https://www.nxp.com/docs/en/application-note/AN11340.pdfVendor Advisory
- https://www.nxp.com/docs/en/application-note/AN13089.pdfVendor 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.htmlMitigation, Third Party Advisory
- https://www.nxp.com/docs/en/application-note/AN11340.pdfVendor Advisory
- https://www.nxp.com/docs/en/application-note/AN13089.pdfVendor Advisory
- https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.