CVE-2021-43527
CRITICAL9.8EPSS 5.2%nss - security update
Published: 12/8/2021Modified: 4/28/2026
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.
Affected packages (4)
- Alpine/nssfrom 0, < 3.60-r2
- Debian/nssfrom 0, < 2:3.61-1+deb11u1
- Debian/nssfrom 0, < 2:3.26.2-1.1+deb9u3
- Debian/nssfrom 0, < 2:3.42.1-1+deb10u4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |