How severe is CVE-2015-8838?

CVE-2015-8838 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2015-8838 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8838?

CVE-2015-8838 primarily affects Php. In total, 59 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-8838?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-8838 published?

CVE-2015-8838 was published on 2016-05-16 and last updated on 2026-06-17.

CVE-2015-8838

CVE-2015-8838 is a medium-severity vulnerability in Php with a CVSS 3.x base score of 5.9. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Php
Published: 2016-05-16
Last modified: 2026-06-17

Description

ext/mysqlnd/mysqlnd.c in PHP before 5.4.43, 5.5.x before 5.5.27, and 5.6.x before 5.6.11 uses a client SSL option to mean that SSL is optional, which allows man-in-the-middle attackers to spoof servers via a cleartext-downgrade attack, a related issue to CVE-2015-3152.

Frequently asked questions

What is CVE-2015-8838?: ext/mysqlnd/mysqlnd.c in PHP before 5.4.43, 5.5.x before 5.5.27, and 5.6.x before 5.6.11 uses a client SSL option to mean that SSL is optional, which allows man-in-the-middle attackers to spoof servers via a cleartext-downgrade attack, a related issue to CVE-2015-3152.
How severe is CVE-2015-8838?: CVE-2015-8838 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2015-8838 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8838?: CVE-2015-8838 primarily affects Php. In total, 59 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-8838?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-8838 published?: CVE-2015-8838 was published on 2016-05-16 and last updated on 2026-06-17.

References

Affected products (59)

cpe:2.3:a:php:php:5.5.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:beta3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:beta4:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.7:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.8:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.9:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.10:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.11:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.12:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.13:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.14:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.15:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.16:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.17:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.18:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.19:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.20:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.21:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.22:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.23:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.24:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.25:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.26:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.6.0:alpha1:*:*:*:*:*:*

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Browse all CWE-284 (Improper Access Control) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

45.84.120.3 (ipv4-addr)
221.161.235.168 (ipv4-addr)
200.196.50.91 (ipv4-addr)
187.141.71.166 (ipv4-addr)
187.110.238.50 (ipv4-addr)
116.255.252.44 (ipv4-addr)
113.164.66.10 (ipv4-addr)
103.38.219.22 (ipv4-addr)