cvedb.io
CVE-2021-43527
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2021-12-08T22:15:09.163 · Last modified 2026-06-17T04:11:04.203

Summary

NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS \#7, or PKCS \#12 are likely to be impacted. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how they configure NSS. *Note: This vulnerability does NOT impact Mozilla Firefox.* However, email clients and PDF viewers that use NSS for signature verification, such as Thunderbird, LibreOffice, Evolution and Evince are believed to be impacted. This vulnerability affects NSS < 3.73 and NSS < 3.68.1.

Affected products

mozilla — nss

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.