How severe is CVE-2016-6621?

CVE-2016-6621 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-6621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6621?

CVE-2016-6621 primarily affects Phpmyadmin. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-6621 published?

CVE-2016-6621 was published on 2017-01-31 and last updated on 2026-06-17.

CVE-2016-6621

CVE-2016-6621 is a high-severity vulnerability in Phpmyadmin with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 5.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Phpmyadmin
Published: 2017-01-31
Last modified: 2026-06-17

Description

The setup script for phpMyAdmin before 4.0.10.19, 4.4.x before 4.4.15.10, and 4.6.x before 4.6.6 allows remote attackers to conduct server-side request forgery (SSRF) attacks via unspecified vectors.

Frequently asked questions

What is CVE-2016-6621?: The setup script for phpMyAdmin before 4.0.10.19, 4.4.x before 4.4.15.10, and 4.6.x before 4.6.6 allows remote attackers to conduct server-side request forgery (SSRF) attacks via unspecified vectors.
How severe is CVE-2016-6621?: CVE-2016-6621 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-6621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6621?: CVE-2016-6621 primarily affects Phpmyadmin. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-6621 published?: CVE-2016-6621 was published on 2017-01-31 and last updated on 2026-06-17.

References

Affected products (36)

cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.0:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.2:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.3:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.4:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.5:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.6:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.6.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.7:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.8:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.9:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.10:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.11:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.12:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.13:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.13.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.14.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.2:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.3:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.4:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.5:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.6:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.8:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.4.15.9:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.0:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.0:rc2:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.1:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.2:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.4:*:*:*:*:*:*:*
cpe:2.3:a:phpmyadmin:phpmyadmin:4.6.5:*:*:*:*:*:*:*

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