CVE-2017-18264

highpriority · track · 40EPSS 0.028 · 87 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.82% (87th) EPSS

CVSS 7.5 · high

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

An issue was discovered in libraries/common.inc.php in phpMyAdmin 4.0 before 4.0.10.20, 4.4.x, 4.6.x, and 4.7.0 prereleases. The restrictions caused by $cfg['Servers'][$i]['AllowNoPassword'] = false are bypassed under certain PHP versions (e.g., version 5). This can allow the login of users who have no password set even if the administrator has set $cfg['Servers'][$i]['AllowNoPassword'] to false (which is also the default). This occurs because some implementations of the PHP substr function return false when given '' as the first argument.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.09criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269US

affected products (10)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin4.0.0 → 4.0.10.20nvdUScpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin4.4.0 → 4.4.15.10nvdUScpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin4.6.0 → 4.6.6nvdUScpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin= 4.7.0nvdUScpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
Packagist phpmyadmin/phpmyadmin4.0 → 4.0.10.20osvUSpkg:composer/phpmyadmin/phpmyadmin
Packagist phpmyadmin/phpmyadmin4.4.0 → 4.4.15.10osvUSpkg:composer/phpmyadmin/phpmyadmin
Packagist phpmyadmin/phpmyadmin4.6.0 → 4.6.6osvUSpkg:composer/phpmyadmin/phpmyadmin
Packagist phpmyadmin/phpmyadmin4.7.0-beta1 → 4.7.0osvUSpkg:composer/phpmyadmin/phpmyadmin

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-5868-g58j-vrj5phpMyAdmin Improper Privilege Management2022-05-13ghsa · osvUS
An issue was discovered in libraries/common.inc.php in phpMyAdmin 4.0 before 4.0.10.20, 4.4.x, 4.6.x, and 4.7.0 prereleases. The restrictions caused by $cfg['Servers'][$i]['AllowNoPassword'] = false are bypassed under certain PHP versions (e.g., version 5). This can allow the login of users who have no password set even if the administrator has set $cfg['Servers'][$i]['AllowNoPassword'] to false (which is also the default). This occurs because some implementations of the PHP substr function return false when given '' as the first argument.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2018-05-01modified 2026-06-17

references (9)

External citations — patches, advisories, analysis.

scry

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