How severe is CVE-2021-43527?

This vulnerability has a severity rating of CRITICAL with a CVSS score of 9.8 out of 10.

What type of vulnerability is CVE-2021-43527?

This is classified as CWE-787, which is a common weakness in software security.

CVE-2021-43527 - CRITICAL Severity | CVSS 9.8

Vulnerability Description

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.

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