Falhas do tipo CWE-401

661 resultados

Fuga de memória - liberação não realizada após uso

Ocorre quando o código aloca memória (heap ou recursos) mas falha em liberá-la quando não é mais necessária. A memória fica presa no processo, reduzindo gradualmente a memória disponível até causar degradação de performance ou crash. É especialmente crítico em serviços que rodam indefinidamente (daemons, APIs, servidores).

Exemplo

Um servidor web que processa requisições sem liberar buffers de conexão fechada. Após milhares de requisições, acumula KB/MB de lixo na memória. Ou uma função que abre arquivo/socket e retorna sem chamar close() em todos os caminhos possíveis (incluindo exceções).

Como mitigar

Use padrões como RAII (Resource Acquisition Is Initialization) em C++, try-finally ou context managers em Python/Java, ou verificadores de vazamento (valgrind, AddressSanitizer). Revise especialmente blocos de exceção e retornos prematuros. Testes de longa duração ajudam a detectar fugas acumulativas.

CVE-2021-3905—A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially eEPSS 2.0%CVE-2022-24756HIGHMissing Release of Memory after Effective Lifetime in Bareos DirectorEPSS 1.9%CVE-2021-20209—A memory leak vulnerability was found in Privoxy before 3.0.29 in the show-status CGI handler when no action files are configured.EPSS 1.9%CVE-2021-39176HIGHMissing Release of Memory after Effective Lifetime in detect-character-encodingEPSS 1.9%CVE-2024-3653MEDIUMUndertow: learningpushhandler can lead to remote memory dos attacksEPSS 1.9%CVE-2021-27386HIGHA vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 UpdatEPSS 1.8%CVE-2021-33645—The th_read() function doesn’t free a variable t->th_buf.gnu_longlink after allocating memory, which may cause a memory leak.EPSS 1.8%CVE-2021-33646—The th_read() function doesn’t free a variable t->th_buf.gnu_longname after allocating memory, which may cause a memory leak.EPSS 1.8%CVE-2024-1023MEDIUMIo.vertx/vertx-core: memory leak due to the use of netty fastthreadlocal data structures in vertxEPSS 1.7%CVE-2021-37205HIGHA vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CEPSS 1.6%CVE-2024-24267HIGHgpac v2.2.1 (fixed in v2.4.0) was discovered to contain a memory leak via the gfio_blob variable in the gf_fileio_from_blob function.EPSS 1.6%CVE-2021-4213—A flaw was found in JSS, where it did not properly free up all memory. Over time, the wasted memory builds up in the server memory, saturatiEPSS 1.6%CVE-2021-3492HIGHUbuntu linux kernel shiftfs file system double free vulnerabilityEPSS 1.5%CVE-2024-1394HIGHGolang-fips/openssl: memory leaks in code encrypting and decrypting rsa payloadsEPSS 1.5%CVE-2020-25689MEDIUMA memory leak flaw was found in WildFly in all versions up to 21.0.0.Final, where host-controller tries to reconnect in a loop, generating nEPSS 1.5%CVE-2025-25199HIGHBCryptGenerateSymmetricKey memory leakEPSS 1.4%CVE-2021-34698HIGHCisco Web Security Appliance Proxy Service Denial of Service VulnerabilityEPSS 1.4%CVE-2021-1229MEDIUMCisco NX-OS Software ICMP Version 6 Memory Leak Denial of Service VulnerabilityEPSS 1.4%CVE-2021-1387HIGHCisco NX-OS Software IPv6 Netstack Denial of Service VulnerabilityEPSS 1.4%CVE-2022-2963HIGHA vulnerability found in jasper. This security vulnerability happens because of a memory leak bug in function cmdopts_parse that can cause aEPSS 1.4%