THREATPORT/VULNERABILITY/CVE-2020-36326
CRITICAL SEVERITY

CVE-2020-36326

Phpmailer vulnerability

CVSS
9.8
EPSS
3.1%
EPSS pct
86th
Exploited
No known
PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UNC pathname. NOTE: this is similar to CVE-2018-19296, but arose because 6.1.8 fixed a functionality problem in which UNC pathnames were always considered unreadable by PHPMailer, even in safe contexts. As an unintended side effect, this fix eliminated the code that blocked addAttachment exploitation.
Affected vendor
Phpmailer Project
Affected product
Phpmailer
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-502 — Deserialization of Untrusted Data
Published
2021-04-28

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2020-36326

  • Confirm whether Phpmailer Project Phpmailer is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-36326.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-36326

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-36326 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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