Critical 9.8Published Dec 8, 2021

CVE-2021-43527NSS (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.

Updated under an hour ago (Nov 2, 2026, 1:40 AM ET)

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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.

CVSS: 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

mozilla nss mozilla:nss	before 3.73	NVD
mozilla nss_esr mozilla:nss_esr	before 3.68.1	NVD
netapp cloud_backup netapp:cloud_backup	all versions	NVD
netapp e-series_santricity_os_controller netapp:e-series_santricity_os_controller	from 11.0 through 11.70.1	NVD
oracle communications_cloud_native_core_binding_support_function oracle:communications_cloud_native_core_binding_support_function	1.11.0	NVD
oracle communications_cloud_native_core_network_repository_function oracle:communications_cloud_native_core_network_repository_function	1.15.0; 1.15.1	NVD
oracle communications_cloud_native_core_network_slice_selection_function oracle:communications_cloud_native_core_network_slice_selection_function	1.8.0	NVD
oracle communications_policy_management oracle:communications_policy_management	12.6.0.0.0	NVD
starwindsoftware starwind_san_&_nas starwindsoftware:starwind_san_&_nas	v8r13	NVD
starwindsoftware starwind_virtual_san starwindsoftware:starwind_virtual_san	v8r13	NVD

References

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1737470	issue-tracking, permissions-required, vendor-advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf	third-party-advisory
https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/	vendor-advisory
https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/	vendor-advisory
https://security.gentoo.org/glsa/202212-05	third-party-advisory
https://security.netapp.com/advisory/ntap-20211229-0002/	third-party-advisory
https://www.mozilla.org/security/advisories/mfsa2021-51/	vendor-advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	patch, third-party-advisory
https://www.starwindsoftware.com/security/sw-20220802-0001/	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.