CVE-2021-38195
CRITICAL
9.8
CVSS Score
Published: August 8, 2021 at 05:07 AM UTC
Updated: June 17, 2026 at 04:01 AM UTC
1 product affected across 1 vendorLIBSECP256K1
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Severity
CRITICAL9.8
Exploit prediction
EPSS 0.9%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
LIBSECP256K1· Paritycargo
95%v < 0.5.0
Affected range stops below 0.5.0, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.mdx_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://rustsec.org/advisories/RUSTSEC-2021-0076.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-347
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