CVE-2017-12639: Stack based buffer overflow in Ipswitch IMail server up to and including 12.5.5 allows remote attackers to exe

Q: How do I fix CVE-2017-12639?

imail server: upgrade to newer than 12.5.5. Exact commands for each OS are on this page.

Q: Is CVE-2017-12639 being exploited?

CVE-2017-12639 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-12639 affect?

CVE-2017-12639 affects imail server. Severity is critical (CVSS 9.8). 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 ETRE or ETCTERARED.

Q: How urgent is CVE-2017-12639?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2017-12639 is a critical-severity flaw (CVSS 9.8) affecting imail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ETRE or ETCTERARED.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-10-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ipswitch

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-10-03 01:29 UTCPublished CVE record published
2026-06-17 01:03 UTCUpdated Record last modified

ipswitch imail server UPGRADE

Affected: <= 12.5.5

Fixed in: newer than 12.5.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy imail-server || rpm -q imail-server || imail-server --version

2. UPGRADE to newer than 12.5.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade imail-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade imail-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-12639?

imail server: upgrade to newer than 12.5.5. Exact commands for each OS are on this page.

Is CVE-2017-12639 being exploited?

CVE-2017-12639 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-12639 affect?

CVE-2017-12639 affects imail server. Severity is critical (CVSS 9.8). 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 ETRE or ETCTERARED.

How urgent is CVE-2017-12639?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-12638 CRITICAL 9.8 UPGRADE Stack based buffer overflow in Ipswitch IMail server up to and including 12.5.5 allows remote attackers to exe

References

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