What is CVE-2023-4421?

CVE-2023-4421 is a vulnerability in Mozilla Nss. Published 2023-12-12.

Is CVE-2023-4421 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mozilla Nss

CVE-2023-4421

The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-c…

EPSS: 0.002 (45.2th percentile) — read the EPSS interpretation.

Affected products

Mozilla Nss — versions unspecified

Public proof-of-concept exploits

alexcowperthwaite/PasskeyScanner

References

bugzilla.mozilla.org/show_bug.cgi
www.mozilla.org/security/advisories/mfsa2023-53/

Frequently asked questions

What is CVE-2023-4421?: CVE-2023-4421 is a vulnerability in Mozilla Nss. Published 2023-12-12.
Is CVE-2023-4421 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.