Critical severity · published Aug 8, 2021
CVE-2021-38195
An issue was discovered in the libsecp256k1 crate before 0.5.0 for Rust
9.8
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libsecp256k1 · Parity
before 0.5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38195
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-38195
Third Party Advisory
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.md
Exploit
https://rustsec.org/advisories/RUSTSEC-2021-0076.html
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