CVE-2017-15130

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-02 · updated 2026-06-17
Weakness: CWE-400

Description

A denial of service flaw was found in dovecot before 2.2.34. An attacker able to generate random SNI server names could exploit TLS SNI configuration lookups, leading to excessive memory usage and the process to restart.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 17.10
Debian Linux: 8.0, 9.0
dovecot: before 2.2.34 — fixed in 2.2.34

How to fix

Upgrade to a fixed version: dovecot 2.2.34. Check the vendor advisory for mitigations.

References

http://seclists.org/oss-sec/2018/q1/205
https://bugzilla.redhat.com/show_bug.cgi?id=1532356
https://lists.debian.org/debian-lts-announce/2018/03/msg00036.html
https://usn.ubuntu.com/3587-1/
https://usn.ubuntu.com/3587-2/
https://www.debian.org/security/2018/dsa-4130
https://www.dovecot.org/list/dovecot-news/2018-February/000370.html
http://seclists.org/oss-sec/2018/q1/205
https://bugzilla.redhat.com/show_bug.cgi?id=1532356
https://lists.debian.org/debian-lts-announce/2018/03/msg00036.html
https://usn.ubuntu.com/3587-1/
https://usn.ubuntu.com/3587-2/

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