CVSS 3.1 Score 6.5 of 10 (medium)


Published Dec 12, 2023
Updated: Dec 20, 2023
CWE ID 203


CVE-2023-4421 is a cyber vulnerability that affects NSS, a cryptographic library used in various products. The vulnerability allows attackers to decrypt intercepted PKCS#1 v1.5 ciphertexts or forge signatures using the victim's key. The issue arises from the leakage of information through a timing side-channel, exposing both the correctness of the padding and the length of the encrypted message. To remediate this vulnerability, NSS version 3.61 or higher should be implemented, as it incorporates an implicit rejection algorithm that returns a deterministic random message when invalid padding is detected. This vulnerability poses a medium risk to organizations, with a base severity score of 6.5 and a high confidentiality impact.

Leverage our Vulnerability Intelligence module to secure your systems now - get detailed insights on CVE-2024-37364. Book your demo today.


Explore Beyond the CVE Basics with Recorded Future's Vulnerability Intelligence

Note: This is just a basic overview providing quick insights into CVE-2023-4421 information. Gain full access to comprehensive CVE data, risk scores, prioritization, and mitigation data through Recorded Future's Vulnerability Intelligence:
  • Prioritize with Risk-Based Scoring
  • Explore the Extensive Vulnerability Database
  • Receive Early Alerts on Emerging CVEs
  • Focus on Critical Exploitable Vulnerabilities
  • Streamline Remediation with Integration Options