CVE-2017-20240

EUVD-2017-18978
Crypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks.

These versions use Perl's built-in eq comparison. Discrepancies in timing could be used to guess the underlying derived-key.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 24%
Debian logo
Debian Releases
Debian Product
Codename
libcrypt-pbkdf2-perl
bookworm
vulnerable
bullseye
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
perl-Crypt-PBKDF2
Amazon Linux 2023
0:0.261630-1.amzn2023.0.1
fixed
Common Weakness Enumeration
References
https://github.com/arodland/Crypt-PBKDF2/pull/6
https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.161520/source/lib/Crypt/PBKDF2.pm#L123-148
https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes
http://www.openwall.com/lists/oss-security/2026/06/12/3