Vulnerability · Published Jun 6, 2021 · Assigned by mitre
CVE-2021-33881
Medium 4.2
In plain English
A medium-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).
Severity (CVSS NVD)4.2Medium
Exploit odds (30 days)0.4%top 64.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 products (as reported)
References
- https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html x_refsource_MISC
- https://www.nxp.com/docs/en/application-note/AN13089.pdf x_refsource_MISC
- https://www.nxp.com/docs/en/application-note/AN11340.pdf x_refsource_MISC
- https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/ x_refsource_MISC