Weaknesses of type CWE-331

101 results

Entropia insuficiente em geração de valores aleatórios

A aplicação gera números aleatórios, tokens, chaves ou IDs usando fontes de entropia fraca ou previsível, permitindo que um atacante adivinhe ou reproduza esses valores. Isso compromete mecanismos que dependem de aleatoriedade criptográfica, como sessões, recuperação de conta e tokens de autenticação.

Example

Um sistema gera tokens de reset de senha usando Math.random() em JavaScript ou com seed baseado em timestamp previsível, permitindo que um atacante calcule o token válido antes da janela de expiração e resete a senha de qualquer usuário.

How to mitigate

Use geradores criptograficamente seguros nativos da plataforma (como `crypto.getRandomValues()` no navegador, `secrets` em Python ou `SecureRandom` em Java). Nunca use Math.random(), rand() ou srand(). Valide e revogue tokens após uso único quando possível.

CVE-2023-36610MEDIUM ​The affected TBox RTUs generate software security tokens using insufficient entropy. The random seed used to generate the software tokens EPSS 0.5%CVE-2026-62646CRITICALA vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70). A session identifier is generated using an algorithm with insufEPSS 0.5%CVE-2026-19906MEDIUMpkp pkp-lib API Key Generation APIProfileForm.php setData entropyEPSS 0.5%CVE-2026-19748MEDIUMTenda CH7 Kylin Web Service CWebSessionManager_ParseSession entropyEPSS 0.5%CVE-2023-34973LOWQTS, QuTS heroEPSS 0.5%CVE-2025-66565CRITICALFiber Utils UUIDv4 and UUID Silent Fallback to Predictable ValuesEPSS 0.5%CVE-2017-2626MEDIUMIt was discovered that libICE before 1.0.9-8 used a weak entropy to generate keys. A local attacker could potentially use this flaw for sessEPSS 0.5%CVE-2026-27490HIGHCombodo iTop: Weak secret generation for inline imageEPSS 0.4%CVE-2025-54885MEDIUMThinbus generates insufficient entropy: 252 bits vs minimum 256 bitsEPSS 0.4%CVE-2026-46473HIGHAuthen::TOTP versions before 0.1.1 for Perl generate secrets using randEPSS 0.4%CVE-2025-1828HIGHPerl's Crypt::Random module after 1.05 and before 1.56 may use rand() function for cryptographic functionsEPSS 0.4%CVE-2021-3505—A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug inEPSS 0.4%CVE-2026-41080LOWlibexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.EPSS 0.4%CVE-2024-22473MEDIUMUninitialized TRNG used for ECDSA after EM2/EM3 sleep for VSE devicesEPSS 0.4%CVE-2022-34746MEDIUMAn insufficient entropy vulnerability caused by the improper use of randomness sources with low entropy for RSA key pair generation was founEPSS 0.4%CVE-2025-29311HIGHLimited secret space in LLDP packets used in onos v2.7.0 allows attackers to obtain the private key via a bruteforce attack. Attackers are aEPSS 0.4%CVE-2025-15387HIGHQNO Technology｜VPN Firewall - Insufficient EntropyEPSS 0.4%CVE-2026-42155CRITICALMagento LTS: Weak API Session ID — Predictable MD5 of Time-Derived InputsEPSS 0.4%CVE-2026-8700HIGHCrypt::DSA versions before 1.20 for Perl generate seeds using randEPSS 0.4%CVE-2024-56370MEDIUMNet::Xero 0.044 and earlier for Perl uses insecure rand() function for cryptographic functionsEPSS 0.4%