What is CVE-2017-12843?

CVE-2017-12843 is a medium-severity vulnerability in Cyrusimap Cyrus Imap, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2017-08-22.

How severe is CVE-2017-12843?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Cyrusimap Cyrus Imap

CVE-2017-12843

Cyrus IMAP before 3.0.3 allows remote authenticated users to write to arbitrary files via a crafted (1) SYNCAPPLY, (2) SYNCGET or (3) SYNCRESTORE command.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-08-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Cyrusimap Cyrus Imap
Fedoraproject Fedora — versions 26

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/cyrusimap/cyrus-imapd/commit/5edadcfb83bf27107578830801817f9e6d0ad941 (Third Party Advisory)
www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.3.html (Release Notes, Vendor Advisory)
github.com/cyrusimap/cyrus-imapd/commit/53c4137bd924b954432c6c59da7572c4c5ffa901 (Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2017-12843?: CVE-2017-12843 is a medium-severity vulnerability in Cyrusimap Cyrus Imap, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2017-08-22.
How severe is CVE-2017-12843?: Medium severity. CVSS v3 base score is 6.5 out of 10.