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No exploitation reported

CVE-2016-20013

No exploitation reported by the sources we read.

  • Published2022-02-19
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-02-1905:15CVE publishedNVD

Versions per branch

NVD
Sha256crypt project sha256crypt
BranchAffectedFixed in
0.6≤ 0.6no fix published
Sha512crypt project sha512crypt
BranchAffectedFixed in
0.6≤ 0.6no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • eglibcUbuntu:Pro:14.04:LTSall versions · no fixed version listedand 1 other package
  • glibcRoot:Ubuntu:22.04all versions · fixed in 2.35-0ubuntu3.15.aikido.5and 1 other package
  • sssdUbuntu:Pro:20.04:LTSall versions · no fixed version listedand 2 other packages
  • sssdUbuntu:Pro:18.04:LTSall versions · no fixed version listedand 2 other packages
  • sssdUbuntu:Pro:16.04:LTSall versions · no fixed version listedand 2 other packages
  • sssdUbuntu:24.04:LTSall versions · no fixed version listedand 3 other packages
  • sssdUbuntu:22.04:LTSall versions · no fixed version listedand 4 other packages
  • syslinuxUbuntu:20.04:LTSall versions · no fixed version listedand 2 other packages

3 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-02-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7rf5-g36v-wpjh

Frequently asked questions

What is 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.

Is CVE-2016-20013 actively exploited?

Active exploitation of CVE-2016-20013 has not been confirmed. Its EPSS score was 2.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-20013?

CVE-2016-20013 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record