CVE-2021-32033Public exploit

Authentication bypass via unauthenticated RTC changes

Published Jun 16, 2021 · Updated Aug 3, 2024

Authentication bypass in Protectimus SLIM NFC 70 10.01 allows physically proximate attackers to obtain valid future TOTP passwords via NFC. The NFC command interface changes the token's RTC without authentication or coupling the change to its seed, enabling an attacker to advance time, record OTPs, and restore the clock. Brief physical possession is required, and account access additionally requires the other authentication factors, while the recorded OTPs remain usable at their chosen future times.

CVSS severity4.6
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Protectimus SLIM NFC 70 10.01 allows physically proximate attackers to obtain valid future TOTP passwords via NFC. The NFC command interface changes the token's RTC without authentication or coupling the change to its seed, enabling an attacker to advance time, record OTPs, and restore the clock. Brief physical possession is required, and account access additionally requires the other authentication factors, while the recorded OTPs remain usable at their chosen future times.

The record

CVE
CVE-2021-32033
Published
Jun 16, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-335, CWE-15, T1556.006
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

1.9NIST NVDAV:L/AC:M/Au:N/C:P/I:N/A:N
4.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-335Incorrect Usage of Seeds in Pseudo-Random Number Generator (PRNG)
CWE-15External Control of System or Configuration Setting
T1556.006Modify Authentication Process: Multi-Factor Authentication

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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