Vulnerability in PHP
CVE-2015-6838
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 after the principal argument loop, 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-2015-6837.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.081 (94.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.073 · newest: 0.081 · change: +0.009
Affected products
- PHP — versions 5.6.0, 5.6.1, 5.6.2
- Xmlsoft Libxml2
Public proof-of-concept exploits
References
- www.securitytracker.com/id/1033548 (vdb-entry)
- bugs.php.net/bug.php
- php.net/ChangeLog-5.php
- www.securityfocus.com/bid/76733 (vdb-entry)
- www.debian.org/security/2015/dsa-3358 (vendor-advisory)
- security.gentoo.org/glsa/201606-10 (vendor-advisory)
Frequently asked questions
- What is CVE-2015-6838?
- CVE-2015-6838 is a high-severity vulnerability in PHP. CVSS score: 7.5/10. Published 2016-05-16.
- How severe is CVE-2015-6838?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2015-6838 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.