CVE-2020-12607

An issue was discovered in fastecdsa before 2.1.2. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. This behavior is not solely a usability problem. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.

• CWE-347

• https://github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458cIssue Tracking, Patch, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8dePatch, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1Patch, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/issues/52Exploit, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458cIssue Tracking, Patch, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8dePatch, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1Patch, Third Party Advisory
• https://github.com/AntonKueltz/fastecdsa/issues/52Exploit, Third Party Advisory

Published

Jun 2, 2020

Last Modified

Jun 17, 2026

Status

Modified

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