Weakness (CWE)
CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.
More detail
When a non-cryptographic PRNG is used in a cryptographic context, it can expose the cryptography to certain types of attacks.
Often a pseudo-random number generator (PRNG) is not designed for cryptography. Sometimes a mediocre source of randomness is sufficient or preferable for algorithms that use random numbers. Weak generators generally take less processing power and/or do not use the precious, finite, entropy sources on a system. While such PRNGs might have very useful features, these same features could be used to break the cryptography.
How to prevent it (1 mitigation)
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Implementation
Use functions or hardware which use a hardware-based random number generation for all crypto. This is the recommended solution. Use CyptGenRandom on Windows, or hw_rand() on Linux.
Source: MITRE CWE-338
188 results · Feed
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Medium 4.8
UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes
UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes() function seeds libc rand() with time(0) + getpid() + rand() and generates a 16-…
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Critical 9.1
Weak Cryptographic Key Derivation Exposed All Stored Credentials
IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow disclosure of all stored credentials due to the use of a weak and reversible key derivation mechanism for encryption at rest.
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Medium 5.9
Net::BitTorrent versions before 2.1.0 for Perl generate the MSE Diffie-Hellman private key with a non-cryptographic PRNG
Net::BitTorrent versions before 2.1.0 for Perl generate the MSE Diffie-Hellman private key with a non-cryptographic PRNG. The MSE (Message Stream Encryption) handshake derives its 160-bit Diffie-Hellman private key from Perl's rand(), a non-cryptographic dran…
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Critical 9.1
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter. When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, includin…
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Critical 9.8
In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429 account…
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Medium 5.3
Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely
Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, the heap address of an anonymous hash, and the PID. T…
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Critical 9.1
Dancer2::Plugin::Auth::OAuth versions before 0.22 for Perl default to a predictable nonce
Dancer2::Plugin::Auth::OAuth versions before 0.22 for Perl default to a predictable nonce. The default nonce was generated using an MD5 hash of the epoch time, which is predictable.
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High 7.5
Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts
Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
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High 7.5
haxtheweb/haxcms-php uses insecure method for generating salt
HAX CMS helps manage microsite universe with PHP or NodeJs backends. Versions prior to 26.0.1 use `uniqid` for generating salts, which is unsuitable. Version 26.0.1 fixes the issue.
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High 8.5
Hardcoded Cryptographic Keys and Weak IV Generation in linqi
The linqi application contains hardcoded cryptographic keys. Additionally, the application uses a weak algorithm with a limited ASCII charset to dynamically generate Initialization Vectors (IVs) for AES/CBC encryption, making known-plaintext attacks feasible.…
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Medium 6.5
Weak Randomness / Insecure Cryptographic Primitive (CWE-338) in Get-RandomPassword in BOSH-Ecosystem / windows-utilitie…
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Medium 4.8
Crypt::ScryptKDF versions through 0.010 for Perl uses insecure random number source when no CSPRNG module is available
Crypt::ScryptKDF versions through 0.010 for Perl uses insecure random number source when no CSPRNG module is available. The random_bytes function fell back to using the built-in rand() function when none of the Perl modules Crypt::PRNG, Crypt::OpenSSL::Random…
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Critical 9.1
Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts
Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
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Critical 9.3
Magento LTS: Weak API Session ID — Predictable MD5 of Time-Derived Inputs
Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, the XML-RPC / SOAP API session ID is generat…
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Medium 6.5
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids. Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epo…
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Medium 5.3
Amazon::Credentials versions through 1.2.0 for Perl uses rand to generate encryption keys
Amazon::Credentials versions through 1.2.0 for Perl uses rand to generate encryption keys. Amazon::Credentials stores credentials in an obfuscated form to prevent access to the secrets from a data dump of the object. Before version 1.3.0, the secrets were enc…
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Medium 6.5
WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely
WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely. The session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the …
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High 7.5
Crypt::PasswdMD5 versions through 1.42 for Perl generates insecure random values for salts
Crypt::PasswdMD5 versions through 1.42 for Perl generates insecure random values for salts. The built-in rand function is predictable, and unsuitable for cryptography.
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High 8.7
RELATE: Predictable Token Generation in auth.py and exam.py
RELATE is a web-based courseware package. Prior to commit 2f68e16, RELATE is vulnerable to predictable token generation in auth.py's make_sign_in_key() function and exam.py's gen_ticket_code() function. This issue has been patched via commit 2f68e16.
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Medium 5.9
Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely
Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely. The session id is generated from summing the character codepoints of the absolute pathname with the process id, the epoch time and calls to the built-in rand() functi…
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Medium 4.8
Spring Boot's random value property source uses a weak PRNG unsuitable for secrets
Values produced by ${random.value} are not suitable for use as secrets. ${random.uuid} is not affected. ${random.int} and ${random.long} should never be used for secrets as they are numeric values with a predictable range. Affected: Spring Boot 4.0.0–4.0.5 (f…
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Medium 5.9
SmarterTools SmarterMail < Build 9610 Cryptographic Weakness via Weak RNG
SmarterTools SmarterMail builds prior to 9610 contain a cryptographic weakness in the file and email sharing endpoints that use DES-CBC encryption with keys and initialization vectors derived from System.Random seeded with insufficient entropy, reducing the s…
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High 7.5
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking. The Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors …
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High 7.5
Apache::API::Password versions through 0.5.2 for Perl can generate insecure random values for salts
Apache::API::Password versions through 0.5.2 for Perl can generate insecure random values for salts. The _make_salt and _make_salt_bcrypt methods will attept to load Crypt::URandom and then Bytes::Random::Secure to generate random bytes for the salt. If those…
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Critical 9.1
Solstice::Session versions through 1440 for Perl generates session ids insecurely
Solstice::Session versions through 1440 for Perl generates session ids insecurely. The _generateSessionID method returns an MD5 digest seeded by the epoch time, a random hash reference, a call to the built-in rand() function and the process id. The same metho…
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Medium 5.3
Ado::Sessions versions through 0.935 for Perl generates insecure session ids
Ado::Sessions versions through 0.935 for Perl generates insecure session ids. The session id is generated from a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time …
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Medium 5.3
Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id
Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes using SHA-1…
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High 8.1
Cloudreve is vulnerable to Account Takeover via Weak Cryptographic Token Generation (Insecure PRNG Seeding)
Cloudreve is a self-hosted file management and sharing system. Prior to version 4.13.0, the application uses the weak pseudo-random number generator math/rand seeded with time.Now().UnixNano() to generate critical security secrets, including the secret_key, a…
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Medium 6.7
An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predic…
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High 7.5
PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely
PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely. PAGI::Middleware::Session::Store::Cookie attempts to read bytes from the /dev/urandom device directly. If that fails (for example, on systems withou…
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Critical 9.1
Business::OnlinePayment::StoredTransaction versions through 0.01 for Perl uses an insecure secret key
Business::OnlinePayment::StoredTransaction versions through 0.01 for Perl uses an insecure secret key. Business::OnlinePayment::StoredTransaction generates a secret key by using a MD5 hash of a single call to the built-in rand function, which is unsuitable fo…
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Critical 9.8
HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids
HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids. HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution epoc…
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Critical 9.8
Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions
Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions. In versions 6.06 through 6.16, the random_string function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it gene…
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Critical 9.1
jsrsasign: Incomplete Comparison Allows DSA Private Key Recovery via Biased Nonce Generation
Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the privat…
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Critical 9.1
Net::NSCA::Client versions through 0.009002 for Perl uses a poor random number generator
Net::NSCA::Client versions through 0.009002 for Perl uses a poor random number generator. Version v0.003 switched to use Data::Rand::Obscure instead of Crypt::Random for generation of a random initialisation vectors. Data::Rand::Obscure uses Perl's built-in r…
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Critical 9.1
Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id
Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id. Apache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the epoch …
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Critical 9.8
Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely
Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of…
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Medium 6.5
HTTP::Session2 versions before 1.12 for Perl may generate weak session ids using the rand() function
HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function. The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come …
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High 8.2
Apache::SessionX versions through 2.01 for Perl create insecure session id
Apache::SessionX versions through 2.01 for Perl create insecure session id. Apache::SessionX generates session ids insecurely. The default session id generator in Apache::SessionX::Generate::MD5 returns a MD5 hash seeded with the built-in rand() function, the…
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Critical 9.1
Smolder versions through 1.51 for Perl uses insecure rand() function for cryptographic functions
Smolder versions through 1.51 for Perl uses insecure rand() function for cryptographic functions. Smolder 1.51 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions. …