THREATPORT/VULNERABILITY/CVE-2020-28021
HIGH SEVERITY

CVE-2020-28021

Exim vulnerability

CVSS
8.8
EPSS
4.1%
EPSS pct
90th
Exploited
No known
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.
Affected vendor
Exim
Affected product
Exim
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-05-06

Risk analysis

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

Its EPSS score of 4.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2020-28021

  • Confirm whether Exim Exim is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-28021.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-28021

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-28021 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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