CVE-2021-43527

Estado: ModificadaCrítica (9.8)—

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

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 18%
Percentil entre todas las CVEs puntuadas: 97
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (10)

Mozilla — NSS Mozilla — NSS ESR Netapp — Cloud Backup Netapp — E-series Santricity OS Controller Oracle — Communications Cloud Native Core Binding Support Function Oracle — Communications Cloud Native Core Network Repository Function Oracle — Communications Cloud Native Core Network Slice Selection Function Oracle — Communications Policy Management Starwindsoftware — Starwind SAN & NAS Starwindsoftware — Starwind Virtual SAN

CWE

CWE-787

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2021-43527",
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      "value": "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."
    },
    {
      "lang": "es",
      "value": "NSS (Network Security Services) versiones anteriores a 3.73 o 3.68.1, ESR son vulnerables a un desbordamiento de pila cuando manejan firmas DSA o RSA-PSS codificadas con DER. Es probable que las aplicaciones que usan NSS para manejar firmas codificadas en CMS, S/MIME, PKCS \\#7 o PKCS \\#12 estén afectadas. Las aplicaciones que usan NSS para la comprobación de certificados u otras funcionalidades de TLS, X.509, OCSP o CRL pueden verse afectadas, dependiendo de cómo configuren NSS. *Nota: Esta vulnerabilidad NO afecta a Mozilla Firefox. Sin embargo, se cree que los clientes de correo electrónico y los visores de PDF que usan NSS para la verificación de firmas, como Thunderbird, LibreOffice, Evolution y Evince, pueden verse afectados. Esta vulnerabilidad afecta a NSS versiones anteriores a 3.73 y NSS versiones anteriores a 3.68.1"
    }
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  "lastModified": "2026-06-17T04:11:04.203",
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