What is CVE-2017-12638?

CVE-2017-12638 is a critical-severity vulnerability in Ipswitch Imail Server, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-10-03.

How severe is CVE-2017-12638?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Ipswitch Imail Server

CVE-2017-12638

Stack based buffer overflow in Ipswitch IMail server up to and including 12.5.5 allows remote attackers to execute arbitrary code via unspecified vectors in IMmailSrv, aka ETBL or ETCETERABLUE.

Vulnerability class: Buffer Overflow

Published 2017-10-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.7th percentile), scored 2026-10-29.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Ipswitch Imail Server

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

docs.ipswitch.com/_Messaging/IMailServer/v12.5.6/ReleaseNotes/index.htm (Vendor Advisory)

Frequently asked questions

What is CVE-2017-12638?: CVE-2017-12638 is a critical-severity vulnerability in Ipswitch Imail Server, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-10-03.
How severe is CVE-2017-12638?: Critical severity. CVSS v3 base score is 9.8 out of 10.