Security readout for executives and security teams
Plain-English summary
Foxit PhantomPDF versions before 8.3.7 had a memory consumption issue. The available source says a crafted ArrayBuffer call could consume memory, which points to denial-of-service risk rather than confirmed data theft or system takeover.
Executive priority
Treat this as a targeted cleanup item unless vulnerable Foxit PhantomPDF is widely deployed. Business urgency rises if legacy PDF tooling is common on user workstations or unsupported versions cannot be centrally upgraded.
Technical view
CVE-2018-21238 describes memory consumption in Foxit PhantomPDF before 8.3.7 via ArrayBuffer(0xfffffffe). The public bundle provides no CVSS score, CWE, detailed attack vector, patch note, or proof of active exploitation.
Likely exposure
Organizations are likely exposed only where Foxit PhantomPDF versions earlier than 8.3.7 remain installed. The source bundle does not identify affected CPEs, platforms, deployment modes, or whether later Foxit-branded products are affected.
Exploitation context
The vulnerability is not listed as KEV in the provided bundle, and no cited source claims active exploitation. The available evidence does not establish whether exploitation is remote, local, document-triggered, or browser/plugin-triggered.
Researcher notes
Evidence is sparse. The record identifies a memory consumption condition and affected version boundary, but lacks CVSS, CWE, platform detail, attack preconditions, and confirmed remediation text beyond the before-8.3.7 boundary.
Mitigation direction
- Inventory Foxit PhantomPDF installations and identify versions earlier than 8.3.7.
- Move affected installations off versions earlier than 8.3.7.
- Check Foxit security bulletins for the supported upgrade path.
- Retire unsupported PhantomPDF installations where upgrades are unavailable.
Validation and detection
- Confirm installed Foxit PhantomPDF version numbers on managed endpoints.
- Compare detected versions against the before-8.3.7 affected range.
- Review Foxit bulletin history for the relevant PhantomPDF advisory.
- Monitor endpoint telemetry for repeated Foxit memory exhaustion or crashes.
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.
CVE-2018-21238 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.foxitsoftware.com/support/security-bulletins.phpCVE reference · x_refsource_CONFIRM
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.