CVE-2016-1902

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-06-01 · updated 2026-06-17
Weakness: CWE-310

Description

The nextBytes function in the SecureRandom class in Symfony before 2.3.37, 2.6.x before 2.6.13, and 2.7.x before 2.7.9 does not properly generate random numbers when used with PHP 5.x without the paragonie/random_compat library and the openssl_random_pseudo_bytes function fails, which makes it easier for attackers to defeat cryptographic protection mechanisms via unspecified vectors.

Affected products

Debian Linux: 8.0
symfony: through 2.3.36; 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5 (+16)

References

http://symfony.com/blog/cve-2016-1902-securerandom-s-fallback-not-secure-when-openssl-fails
http://www.debian.org/security/2016/dsa-3588
https://github.com/symfony/symfony/pull/17359
https://www.landaire.net/blog/cve-2016-1902-symfony-securerandom/
http://symfony.com/blog/cve-2016-1902-securerandom-s-fallback-not-secure-when-openssl-fails
http://www.debian.org/security/2016/dsa-3588
https://github.com/symfony/symfony/pull/17359
https://www.landaire.net/blog/cve-2016-1902-symfony-securerandom/

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