CVE-2025-69893

Recovery-seed disclosure via non-constant-time mnemonic search

Published Apr 14, 2026 · Updated Apr 14, 2026

Timing side channel in Trezor firmware 1.13.0 through 1.14.0 allows physically proximate attackers to recover a BIP-39 recovery seed. The mnemonic_to_bits() path uses data-dependent wordlist searching, so timing and branch patterns reveal seed words instead of performing a constant-time lookup. Exploitation requires physical possession of an unlocked device; Model T, Safe 3, and Safe 5 are exposed only with universal firmware and a BIP-39 backup, and seed recovery permits asset theft.

CVSS severity4.6
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timing side channel in Trezor firmware 1.13.0 through 1.14.0 allows physically proximate attackers to recover a BIP-39 recovery seed. The mnemonic_to_bits() path uses data-dependent wordlist searching, so timing and branch patterns reveal seed words instead of performing a constant-time lookup. Exploitation requires physical possession of an unlocked device; Model T, Safe 3, and Safe 5 are exposed only with universal firmware and a BIP-39 backup, and seed recovery permits asset theft.

The record

CVE
CVE-2025-69893
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-385
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record 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

4.6CISA-ADPCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-385Covert Timing Channel

Public exploit references

No public exploit references are available in this record.

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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