CVE-2008-6922: Multiple stack-based buffer overflows in CMailCOM.dll in CMailServer 5.4.6 allow remote attackers to execute a

This week

HIGH 9.3DOWNGRADE

CVE-2008-6922 is a high-severity flaw (CVSS 9.3) affecting cmailserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple stack-based buffer overflows in CMailCOM.dll in CMailServer 5.4.6 allow remote attackers to execute arbitrary code via a long argument to the (1) CreateUserPath, (2) Logout, (3) DeleteMailByUID, (4) MoveToInbox, (5) MoveToFolder, (6) DeleteMailEx, (7) GetMailDataEx, (8) SetReplySign, (9) SetForwardSign, and (10) SetReadSign methods, which are not properly handled by (a) the POP3 Class ActiveX control (CMailCom.POP3); or a long argument t

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	9.3% (top 5%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-08-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: youngzsoft

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2009-08-10 18:30 UTCPublished CVE record published
2026-06-16 23:03 UTCUpdated Record last modified

youngzsoft cmailserver DOWNGRADE

Affected: 5.4.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.4.6

1. Check installed version

apt-cache policy cmailserver || rpm -q cmailserver || cmailserver --version

2. No fixed release: DOWNGRADE to a release before 5.4.6 (Debian / Ubuntu)

apt-cache madison cmailserver sudo apt install cmailserver=<VERSION_BEFORE_5.4.6> sudo apt-mark hold cmailserver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cmailserver sudo dnf downgrade cmailserver-<VERSION_BEFORE_5.4.6> sudo dnf versionlock add cmailserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Youngzsoft CMailServer 5.4.6 - 'CMailCOM.dll' Remote Overwrite (SEH)

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-2008-6922?

cmailserver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-6922 being exploited?

CVE-2008-6922 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-2008-6922 affect?

CVE-2008-6922 affects cmailserver. Severity is high (CVSS 9.3). Multiple stack-based buffer overflows in CMailCOM.dll in CMailServer 5.4.6 allow remote attackers to execute arbitrary code via a long argument to the (1) CreateUserPath, (2) Logout, (3) DeleteMailByUID, (4) MoveToInbox, (5) MoveToFolder, (

How urgent is CVE-2008-6922?

Priority 61/100. Critical severity; EPSS top 5%: very likely to be exploited; Public exploit reference

References

← Back to latest CVEs