Is CVE-2017-11143 in the CISA KEV catalog?

No. CVE-2017-11143 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11143?

CVE-2017-11143 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-11143?

CVE-2017-11143 has an EPSS score of 6.85% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-11143?

Upgrade libapache2-mod-php5 on ubuntu 14.04 to 5.5.9+dfsg-1ubuntu4.22 or later. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2017-11143

HIGHEPSS 93th pctl

7.5

CVSS v3

NVD

Description

In PHP before 5.6.31, an invalid free in the WDDX deserialization of boolean parameters could be used by attackers able to inject XML for deserialization to crash the PHP interpreter, related to an invalid free for an empty boolean element in ext/wddx/wddx.c.

CWE-416Use After Free CWE-502Deserialization of Untrusted Data

How to fix

Remediation Available

libapache2-mod-php5Ubuntu

Fixed in:5.5.9+dfsg-1ubuntu4.22USN-3382-1

libapache2-mod-php7.0Ubuntu

Fixed in:7.0.22-0ubuntu0.16.04.1USN-3382-1

php5Ubuntu

Fixed in:5.5.9+dfsg-1ubuntu4.22USN-3382-1

php5-cgiUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.22USN-3382-1

php5-cliUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.22USN-3382-1

php5-fpmUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.22USN-3382-1

php7.0Ubuntu

Fixed in:7.0.22-0ubuntu0.16.04.1USN-3382-1

php7.0-cgiUbuntu

Fixed in:7.0.22-0ubuntu0.16.04.1USN-3382-1

php7.0-cliUbuntu

Fixed in:7.0.22-0ubuntu0.16.04.1USN-3382-1

php7.0-fpmUbuntu

Fixed in:7.0.22-0ubuntu0.16.04.1USN-3382-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

6.85%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Patch2

Vendor Advisory1

php.net

Other references6

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.