Home/CVE/NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER
CVE

CVE-2021-43527

NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER

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.

CRITICAL · CVSS 9.8 EPSS 0.05243
Schedule remediation
  • EPSS percentile: top 10% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

10
mozilla nss< 3.73
mozilla nss esr< 3.68.1
netapp cloud backupall versions
netapp e-series santricity os controller>= 11.0 and <= 11.70.1
oracle communications cloud native core binding support functionall versions
oracle communications cloud native core network repository functionall versions
oracle communications cloud native core network slice selection functionall versions
oracle communications policy managementall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Dec 2021 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

30
suse-csafSUSE-SU-2025:02334-1
suse-csafSUSE-SU-2024:2189-1
suse-csafSUSE-SU-2024:2190-1
suse-csafSUSE-SU-2024:2183-1
suse-csafSUSE-SU-2024:2185-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.mozilla.org/show_bug.cgi?id=1737470Issue TrackingPermissions RequiredVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdfThird 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/202212-05Third Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0002/Third Party Advisory
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