THREATPORT/VULNERABILITY/CVE-2017-2669
LOW SEVERITY

CVE-2017-2669

Dovecot vulnerability

CVSS
3.7
EPSS
4.6%
EPSS pct
91th
Exploited
No known
Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.
Affected vendor
Dovecot
Affected product
Dovecot
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness type (CWE)
  • CWE-20 — Improper Input Validation
Published
2018-06-21

Risk analysis

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

Its EPSS score of 4.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2017-2669

  • Confirm whether Dovecot Dovecot is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-2669.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-2669

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-2669 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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