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-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.

• CWE-787

• https://bugzilla.mozilla.org/show_bug.cgi?id=1737470Issue Tracking, Permissions Required, Vendor 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
• https://www.mozilla.org/security/advisories/mfsa2021-51/Vendor Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
• https://www.starwindsoftware.com/security/sw-20220802-0001/Third Party Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1737470Issue Tracking, Permissions Required, Vendor 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
• https://www.mozilla.org/security/advisories/mfsa2021-51/Vendor Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
• https://www.starwindsoftware.com/security/sw-20220802-0001/Third Party Advisory

Published

Dec 8, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-43518Teeworlds up to and including 0.7.5 is vulnerable to Buffer …7.8
• CVE-2021-43519Stack overflow in lua_resume of ldo.c in Lua Interpreter 5.1…5.5
• CVE-2021-4352The JobSearch WP Job Board plugin for WordPress is vulnerabl…5.3
• CVE-2021-43521A Buffer Overflow vulnerability exists in zlog 1.2.15 via zl…7.5
• CVE-2021-43522An issue was discovered in Insyde InsydeH2O with kernel 5.1 …7.5
• CVE-2021-43523In uClibc and uClibc-ng before 1.0.39, incorrect handling of…9.6
• CVE-2021-43528Thunderbird unexpectedly enabled JavaScript in the compositi…6.5
• CVE-2021-43529Thunderbird versions prior to 91.3.0 are vulnerable to the h…9.8
• CVE-2021-4353The WooCommerce Dynamic Pricing and Discounts plugin for Wor…5.3
• CVE-2021-43530A Universal XSS vulnerability was present in Firefox for And…6.1
• CVE-2021-43531When a user loaded a Web Extensions context menu, the Web Ex…4.3
• CVE-2021-43532The 'Copy Image Link' context menu action would copy the fin…6.1