CVE-2016-20013

HIGH

sha256crypt and sha512crypt < 0.6 - Denial of Service via Password Length

Title source: llm
STIX 2.1

Description

sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption) because the algorithm's runtime is proportional to the square of the length of the password.

References (3)

Core 3
Core References
Third Party Advisory x_refsource_misc
https://twitter.com/solardiz/status/795601240151457793
Exploit, Third Party Advisory x_refsource_misc
https://akkadia.org/drepper/SHA-crypt.txt

Scores

CVSS v3 7.5
EPSS 0.0220
EPSS Percentile 80.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-770
Status published
Products (2)
sha256crypt_project/sha256crypt < 0.6
sha512crypt_project/sha512crypt < 0.6
Published Feb 19, 2022
Tracked Since Feb 18, 2026