CVE-2021-38195

CRITICAL

libsecp256k1 < 0.5.0 - Improper Verification of Cryptographic Signature via R/S Parameter Overflow

Title source: llm
STIX 2.1

Description

An issue was discovered in the libsecp256k1 crate before 0.5.0 for Rust. It can verify an invalid signature because it allows the R or S parameter to be larger than the curve order, aka an overflow.

References (2)

Core 2
Core References
Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://rustsec.org/advisories/RUSTSEC-2021-0076.html

Scores

CVSS v3 9.8
EPSS 0.0094
EPSS Percentile 56.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-347
Status published
Products (2)
crates.io/libsecp256k1 0 - 0.5.0crates.io
parity/libsecp256k1 < 0.5.0
Published Aug 08, 2021
Tracked Since Feb 18, 2026