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CVE-2019-20399

20
FAUCET Score

CVE-2019-20399 is a timing vulnerability in the Scalar::check_overflow function of Parity libsecp256k1-rs versions prior to 0.3.1. This medium-severity vulnerability (CVSS 5.9) could allow an unauthenticated attacker to remotely leak sensitive information through a side-channel attack, though with high attack complexity. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.3.1CPE matchmatch criteria
cpe:2.3:a:parity:libsecp256k1:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.88%
Probability of exploitation in next 30 days
EPSS Percentile
55.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0088 is in the 13th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: libsecp256k1-rsFixed in: 0.3.1

Vendor Advisories (1)

rustGHSA-7cqg-8449-rmfvmedium

Observable Discrepancy in libsecp256k1-rs

Aug 25, 2021

References

github.com / paritytech/libsecp256k1/commit/11ba23a9766a5079918cd9f515bc100bc8164b50
PatchThird Party Advisory