CVE-2017-18264

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.

Published: 2018-05-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18264 is rated High Risk (71.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.99%). EPSS rose +2.67% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-18264

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.32% 2.99% +2.67%
2 2025-07-30 0.54% 0.32% -0.22%
3 2025-04-01 — 0.54% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18264

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-18264

GitHub Security Advisory for CVE-2017-18264

GHSA-5868-g58j-vrj5 · Severity: critical · Ecosystem: composer — phpMyAdmin Improper Privilege Management

OS Trackers for CVE-2017-18264

vendor priority summary link
debian not yet assigned CVE-2017-18264 not yet assigned priority: Debian including 1 source packages (phpmyadmin), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2017-18264
ubuntu medium CVE-2017-18264 medium priority: Ubuntu including 1 source packages (phpmyadmin), 13 status rows across 13 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): not-affected 9, released 3, DNE 1. https://ubuntu.com/security/CVE-2017-18264

Affected software / configurations for CVE-2017-18264

Vendor Product Version Raw CPE
phpmyadmin phpmyadmin >= 4.0.0, < 4.0.10.20 cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin >= 4.4.0, <= 4.4.15.10 cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin >= 4.6.0, <= 4.6.6 cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
phpmyadmin phpmyadmin 4.7.0 cpe:2.3:a:phpmyadmin:phpmyadmin:4.7.0:beta1:*:*:*:*:*:*
phpmyadmin phpmyadmin 4.7.0 cpe:2.3:a:phpmyadmin:phpmyadmin:4.7.0:rc1:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

References for CVE-2017-18264

cvelogic Threat Intelligence