{
  "cveId": "CVE-2024-1544",
  "url": "https://patchblox.com/security/cve/CVE-2024-1544",
  "summary": "CVE-2024-1544 is fixed in wolfssl on 1 platform by DEBIAN-CVE-2024-1544 (version 5.7.2-0.1), released August 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ECDSA nonce bias caused by truncation",
  "description": "Generating the ECDSA nonce k samples a random number r and then  truncates this randomness with a modular reduction mod n where n is the  order of the elliptic curve. Meaning k = r mod n. The division used  during the reduction estimates a factor q_e by dividing the upper two  digits (a digit having e.g. a size of 8 byte) of r by the upper digit of  n and then decrements q_e in a loop until it has the correct size.  Observing the number of times q_e is decremented through a control-flow  revealing side-channel reveals a bias in the most significant bits of  k. Depending on the curve this is either a negligible bias or a  significant bias large enough to reconstruct k with lattice reduction  methods. For SECP160R1, e.g., we find a bias of 15 bits.",
  "published": "2024-08-27T19:15:16Z",
  "severity": "Moderate",
  "cvss": 4.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
  "cwe": "Observable Discrepancy",
  "epss": 0.00349,
  "epssPercentile": 0.28768,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-1544",
  "fixes": [
    {
      "platform": "linux",
      "product": "wolfssl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.7.2-0.1",
      "fix": "DEBIAN-CVE-2024-1544",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-1544",
      "released": "2024-08-27T19:15:16Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}