CVE-2021-33881

MEDIUM
Published Jun 6, 20215y ago · Modified Jun 17, 20262w ago
4.2 CVSS 3.1
Medium
Find Similar
Published Jun 6, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
4.2
Exploitability
0.5
Impact
3.6
Vector string
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Physical
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-863 Incorrect Authorization Authorization

Affected Products 16

VendorProductVersionRange
nxpmifare_ultralight_ev1_firmware*any
nxpmifare_ultralight_ev1*any
nxpmifare_ultralight_c_firmware*any
nxpmifare_ultralight_c*any
nxpmifare_ultralight_nano_firmware*any
nxpmifare_ultralight_nano*any
nxpntag_210_firmware*any
nxpntag_210*any
nxpntag_212_firmware*any
nxpntag_212*any
nxpntag_213_firmware*any
nxpntag_213*any
nxpntag_215_firmware*any
nxpntag_215*any
nxpntag_216_firmware*any
nxpntag_216*any

References 4

  • blog.quarkslab.com https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html
    MitigationThird Party Advisory
  • nxp.com https://www.nxp.com/docs/en/application-note/AN11340.pdf
    Vendor Advisory
  • nxp.com https://www.nxp.com/docs/en/application-note/AN13089.pdf
    Vendor Advisory
  • sstic.org https://www.sstic.org/2021/presentation/eeprom_it_will_all_end_in_tears/
    ExploitThird Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.