Resource exhaustion in Sha256crypt Project
CVE-2016-20013
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.022 (82.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- twitter.com/solardiz/status/795601240151457793 (Third Party Advisory)
- pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/ (Exploit, Third Party Advisory)
- akkadia.org/drepper/SHA-crypt.txt (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-20013?
- CVE-2016-20013 is a high-severity vulnerability in Sha256crypt Project, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2022-02-19.
- How severe is CVE-2016-20013?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2016-20013 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.