CVE-2021-33881

MEDIUM
4.2
CVSS Score
Published: June 6, 2021 at 03:33 PM UTC
Updated: June 17, 2026 at 03:55 AM UTC
16 products affected across 1 vendorMifare Ultralight Nano FirmwareNtag 212 FirmwareNtag 215 Firmware

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Severity
MEDIUM4.2
Exploit prediction
EPSS 0.4%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
nxp-mifare-ultralight-c (same device)
All versions
nxp-mifare-ultralight-ev1 (same device)
All versions
nxp-mifare-ultralight-nano (same device)
All versions
nxp-ntag-210 (same device)
All versions
nxp-ntag-212 (same device)
All versions
nxp-ntag-213 (same device)
All versions
nxp-ntag-215 (same device)
All versions
nxp-ntag-216 (same device)
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
PHYSICAL
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

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