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Vulnerability record · public intelligence
CVE-2019-13628
UNKNOWN

wolfCrypt leaks cryptographic information via timing side channel

Published Oct 3, 2019 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood0.38%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

wolfCrypt leaks cryptographic information via timing side channel

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

wolfSSL and wolfCrypt 4.0.0 and earlier (when configured without `--enable-fpecc`, `--enable-sp`, or` --enable-sp-math`) contain a timing side channel in ECDSA signature generation. This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used. The issue occurs because ecc.c scalar multiplication might leak the bit length.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
LOW
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. eprint.iacr.org ↗
  2. tches.iacr.org ↗
  3. [oss-security] 20191002 Minerva: ECDSA key recovery from bit-length leakage ↗
  4. minerva.crocs.fi.muni.cz ↗

Record history

Published Oct 3, 2019 · Last refreshed Nov 3, 2026

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