CVE-2015-6837

UnknownEPSS 6.57%

Last modified

CVE-2015-6837 is a vulnerability of currently unknown severity. The xsl_ext_function_php function in ext/xsl/xsltprocessor.c in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13, when libxml2 before 2.9.2 is used, does not consider the possibility of a NULL valuePop return value before proceeding with a free operation during initial error checking, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted XML document, a different vulnerability than CVE-2015-6838.. EPSS estimates a 6.57% chance of exploitation in the next 30 days.

Description

The xsl_ext_function_php function in ext/xsl/xsltprocessor.c in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13, when libxml2 before 2.9.2 is used, does not consider the possibility of a NULL valuePop return value before proceeding with a free operation during initial error checking, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted XML document, a different vulnerability than CVE-2015-6838.

Metrics

EPSS Probability
6.57%

93.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersionsUpdate
PhpPhp5.6.0Alpha1
PhpPhp5.6.1—
PhpPhp5.6.2—
PhpPhp5.6.3—
PhpPhp5.6.4—
PhpPhp5.6.5—
PhpPhp5.6.6—
PhpPhp5.6.7—
PhpPhp5.6.8—
PhpPhp5.6.9—
PhpPhp5.6.10—
PhpPhp5.6.11—
PhpPhp5.6.12—
XmlsoftLibxml2<= 2.9.1—
PhpPhp<= 5.4.44—
PhpPhp5.5.0—
PhpPhp5.5.1—
PhpPhp5.5.2—
PhpPhp5.5.3—
PhpPhp5.5.4—
PhpPhp5.5.5—
PhpPhp5.5.6—
PhpPhp5.5.7—
PhpPhp5.5.8—
PhpPhp5.5.9—
PhpPhp5.5.10—
PhpPhp5.5.11—
PhpPhp5.5.12—
PhpPhp5.5.13—
PhpPhp5.5.14—
PhpPhp5.5.15—
PhpPhp5.5.16—
PhpPhp5.5.17—
PhpPhp5.5.18—
PhpPhp5.5.19—
PhpPhp5.5.20—
PhpPhp5.5.21—
PhpPhp5.5.22—
PhpPhp5.5.23—
PhpPhp5.5.24—
PhpPhp5.5.25—
PhpPhp5.5.26—
PhpPhp5.5.27—
PhpPhp5.5.28—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2015-6837?
The xsl_ext_function_php function in ext/xsl/xsltprocessor.c in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13, when libxml2 before 2.9.2 is used, does not consider the possibility of a NULL valuePop return value before proceeding with a free operation during initial error checking, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted XML document, a different vulnerability than CVE-2015-6838.
How severe is CVE-2015-6837?
Severity scoring for CVE-2015-6837 is pending analysis. The EPSS model estimates a 6.57% probability of exploitation in the next 30 days.
How do I fix CVE-2015-6837?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST