CVE-2016-20013

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://akkadia.org/drepper/SHA-crypt.txtExploit, Third Party Advisory
https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/Exploit, Third Party Advisory
https://twitter.com/solardiz/status/795601240151457793Third Party Advisory
https://akkadia.org/drepper/SHA-crypt.txtExploit, Third Party Advisory
https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/Exploit, Third Party Advisory
https://twitter.com/solardiz/status/795601240151457793Third Party Advisory

Timeline

Published: Feb 19, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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