CVSS 3.1
4.7 mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:NCVE-2019-13628
Medium (4.7) in wolfssl wolfssl. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in wolfcrypt 4.1.0.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
- CWE
- CWE-203
- Published
- Modified
- Record from
- the NVD, synced
Affected
- wolfssl:wolfssl
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-q95h-vc86-hv77 | PyPI | wolfcrypt | <4.1.0 | 4.1.0 |
| PYSEC-2026-1066 | PyPI | wolfcrypt | <4.1.0 | 4.1.0 |