CVE-2017-20240: Crypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks

Security readout for executives and security teams

CVE-2017-20240 affects the Perl Crypt::PBKDF2 module before version 0.261630. Older versions compare derived keys in a way that can leak timing differences. In some conditions, an attacker could use those differences to infer sensitive key material. This is not reported as actively exploited in the provided sources. Exposure is likely limited to Perl applications that directly or transitively use Crypt::PBKDF2 versions before 0.261630 for password or key verification paths reachable by an attacker. Systems not using this CPAN module are not affected based on the provided sources. Treat as a targeted remediation item, not an emergency. Prioritize environments where Perl applications expose authentication or key-verification functions to untrusted users. The business risk is confidentiality loss, but successful exploitation appears technically difficult and no active exploitation is cited. Mitigation focus: Upgrade Crypt::PBKDF2 to version 0.261630 or later.; Check vendor or maintainer guidance for any application-specific upgrade notes.; Identify and update transitive or vendored copies of Crypt::PBKDF2..

Prepared

Jun 12, 2026, 17:14 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.