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ransombravox reclama a GSE-M Technology Sdn. Bhd. · MY · Technologyransomemperador reclama a Bruin Group LLC · US · Otherransomsilentransomgroup reclama a M... M... · Not Foundransomsilentransomgroup reclama a P... H... · Not Foundransomglobal secret group reclama a Graves Fireplaces, Inc. · US · Manufacturingransomincransom reclama a centralrogers.com · US · Otherransomdark project reclama a Asensus Surgical · US · Healthcareransomdark project reclama a The Excalibur Group · US · Not Foundransomsilentransomgroup reclama a P...S...R... · Not Foundransomaurora reclama a Duarte Nursery, Inc. · US · Agriculture and Food Productionransomn0n reclama a 51Ridge (Newark NJ hosting/IT) · US · Technologyransombooba project reclama a Research Foundation of The City University of New York · US · Educationransombooba project reclama a Chicago Vein Institute · US · Healthcareransombooba project reclama a Pearland Pediatrics · US · Healthcareransombravox reclama a GSE-M Technology Sdn. Bhd. · MY · Technologyransomemperador reclama a Bruin Group LLC · US · Otherransomsilentransomgroup reclama a M... M... · Not Foundransomsilentransomgroup reclama a P... H... · Not Foundransomglobal secret group reclama a Graves Fireplaces, Inc. · US · Manufacturingransomincransom reclama a centralrogers.com · US · Otherransomdark project reclama a Asensus Surgical · US · Healthcareransomdark project reclama a The Excalibur Group · US · Not Foundransomsilentransomgroup reclama a P...S...R... · Not Foundransomaurora reclama a Duarte Nursery, Inc. · US · Agriculture and Food Productionransomn0n reclama a 51Ridge (Newark NJ hosting/IT) · US · Technologyransombooba project reclama a Research Foundation of The City University of New York · US · Educationransombooba project reclama a Chicago Vein Institute · US · Healthcareransombooba project reclama a Pearland Pediatrics · US · Healthcare
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CVE Watch8 oct 2026

CVE-2021-3449

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation Cl

CVSS

5.9

Medio

EPSS

63.5%

p99

KEV

—

Exploit Today

30

0-100

Publicado: 25 mar 2021 · Última mod.: 8 oct 2026 · CWE-476

EPSS · 30d
63.5%EPSS · 30 días63.5%
2026-09-222026-10-19
Descripción técnica

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).

Referencias oficiales
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