CVE-2021-33881 Security feature bypass in n/a
Attackers can bypass Monotonic Counter protections on NXP MIFARE Ultralight and NTAG cards by interrupting write operations via RFID tear-off attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-33881?
CVE-2021-33881 is a medium-severity vulnerability in n/a, published on 6 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-863
Which versions are affected by CVE-2021-33881?
It affects 8 products.
Products include Nxp Mifare Ultralight C Firmware, Nxp Mifare Ultralight Ev1 Firmware, Nxp Mifare Ultralight Nano Firmware, Nxp Ntag 210 Firmware, Nxp Ntag 212 Firmware, Nxp Ntag 213 Firmware and 2 more.
How do I fix CVE-2021-33881?
No fix has been published for CVE-2021-33881 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-33881 being exploited?
There is no known exploitation of CVE-2021-33881 in the wild and no public exploit code.
Sources
Also known as GHSA-ff8p-pfwc-wjf2.