Security readout for executives and security teams
Plain-English summary
CVE-2018-14404 is a crash bug in libxml2. If an application processes untrusted XSL input, a malformed XPath expression can trigger a NULL pointer dereference and stop the affected application. The impact is availability loss, not data theft or code execution based on the supplied sources.
Executive priority
Prioritize patching where libxml2 processes untrusted XML/XSL content in production or customer-facing services. For internal-only uses without untrusted input, handle through normal vulnerability management cadence.
Technical view
libxml2 through 2.9.8 has a NULL pointer dereference in xpath.c xmlXPathCompOpEval() when evaluating invalid XPath expressions in XPATH_OP_AND or XPATH_OP_OR cases. CVSS 3.1 is 6.5: network reachable, low complexity, no privileges, user interaction required, high availability impact only.
Likely exposure
Exposure is most likely in servers, appliances, or applications that use libxml2 to process XML, XSLT, or XSL content from users, partners, feeds, or documents. Linux distributions and NetApp advisories indicate downstream product/package relevance.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The described attack outcome is application denial of service through a crash after processing crafted invalid XPath inside untrusted XSL input.
Researcher notes
The affected component is the XPath evaluator, with failure in AND/OR operation handling for invalid XPath. Evidence supports availability impact only. The affected product list in the bundle is incomplete, so distribution and product advisories are important for asset mapping.
Mitigation direction
- Inventory systems and applications using libxml2, especially XSLT-processing paths.
- Apply vendor or distribution security updates for libxml2.
- Review Debian, Ubuntu, Red Hat, and NetApp guidance for affected packages or products.
- Restrict or sandbox processing of untrusted XSL/XML where practical.
- Monitor application crashes tied to XML, XSLT, or XPath parsing.
Validation and detection
- Confirm installed libxml2 package versions against vendor advisory fixed versions.
- Identify public or partner-facing workflows that accept XML, XSL, XSLT, or document imports.
- Check application logs for repeat crashes during XML or XSLT parsing.
- Verify patched systems no longer run libxml2 through 2.9.8 unless vendor-backported.
- Confirm embedded appliances have vendor updates or compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2018-14404 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- [debian-lts-announce] 20180927 [SECURITY] [DLA 1524-1] libxml2 security updateCVE reference · mailing-list, x_refsource_MLIST
- https://gitlab.gnome.org/GNOME/libxml2/issues/10CVE reference · x_refsource_MISC
- USN-3739-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901817CVE reference · x_refsource_MISC
- USN-3739-2CVE reference · vendor-advisory, x_refsource_UBUNTU
- https://bugzilla.redhat.com/show_bug.cgi?id=1595985CVE reference · x_refsource_MISC
- RHSA-2019:1543CVE reference · vendor-advisory, x_refsource_REDHAT
- https://security.netapp.com/advisory/ntap-20190719-0002/CVE reference · x_refsource_CONFIRM
- [debian-lts-announce] 20200909 [SECURITY] [DLA 2369-1] libxml2 security updateCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.