What is the CVSS score of CVE-2021-38195?

CVE-2021-38195 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.9%.

Is there a public PoC exploit available for CVE-2021-38195?

Yes, a public proof-of-concept exploit is available for CVE-2021-38195. Prioritise patching immediately. EPSS: 0.9%.

Is there a patch available for CVE-2021-38195?

Yes, a patch is available for CVE-2021-38195. Update the affected software to the latest version immediately.

Jwt Attack CVE-2021-38195

CRITICAL

Improper Verification of Cryptographic Signature (CWE-347)

2021-08-08 cve@mitre.org

Buffer Overflow Jwt Attack Libsecp256K1

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Aug 08, 2021 - 06:15 nvd

CRITICAL 9.8

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

143 cargo packages depend on libsecp256k1 (18 direct, 127 indirect)

Ecosystem-wide dependent count for version 0.5.0.

DescriptionNVD

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.

AnalysisAI

An issue was discovered in the libsecp256k1 crate before 0.5.0 for Rust. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-347. 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 products include: Parity Libsecp256K1. Version information: before 0.5.0.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.