THREATPORT/VULNERABILITY/CVE-2018-3956
HIGH SEVERITY

CVE-2018-3956

Phantompdf vulnerability

CVSS
7.1
EPSS
49.6%
EPSS pct
99th
Exploited
No known
An exploitable out-of-bounds read vulnerability exists in the handling of certain XFA element attributes of Foxit Software's PDF Reader version 9.1.0.5096. A specially crafted PDF document can trigger an out-of-bounds read, which can disclose sensitive memory content and aid in exploitation when coupled with another vulnerability. An attacker needs to trick the user to open the malicious file to trigger this vulnerability. If the browser plugin extension is enabled, visiting a malicious site can also trigger the vulnerability.
Affected vendor
Foxitsoftware
Affected product
Phantompdf
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Weakness type (CWE)
Published
2019-01-30

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to availability.

Its EPSS score of 49.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2018-3956

  • Confirm whether Foxitsoftware Phantompdf is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2018-3956.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-3956

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2018-3956 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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