CVE-2023-4421
nss: new tlsfuzzer code can still detect timing issues in RSA operations
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 13, 2023
Updated · November 21, 2025
Description
A vulnerability was found in NSS. The interface between the cryptographic library (the softokn) and the rest of NSS is using PKCS#11, and the error reporting (erroring out when the PKCS#1 v1.5 padding checks fail) that PKCS#11 requires is very noisy, making it easy to detect over the network.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE-208 · Observable Timing Discrepancy