CVE-2021-43571

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.03% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 61.3% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-11-09 21:05Z4 YR AGO

Last updated

2024-08-04 04:03Z2 YR AGO

Reserved

2021-11-09

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-347Improper Verification of Cryptographic SignatureBase

Data version

5.1

Document digest

63f90329fd6a05aef42c927dfc64ffc99cd34f98e05735c04b7a4443872afdc1

• research.nccgroup.comhttps://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/x_refsource_MISC
• github.comhttps://github.com/starkbank/ecdsa-node/releases/tag/v1.1.3x_refsource_MISC