CVE-2002-0416: Buffer overflow in SH39 MailServer 1.21 and earlier allows remote attackers to cause a denial of service, and

This month

HIGH 10.0DOWNGRADE

CVE-2002-0416 is a high-severity flaw (CVSS 10.0) affecting mailserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in SH39 MailServer 1.21 and earlier allows remote attackers to cause a denial of service, and possibly execute arbitrary code, via a long command to the SMTP port.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	5.5% (top 7%)
CISA exploited list	No
Published	2002-08-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: sh39

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

Am I affected?

Timeline

2002-08-12 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

sh39 mailserver DOWNGRADE

Affected: 1.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.1 (Debian / Ubuntu)

apt-cache madison mailserver sudo apt install mailserver=<VERSION_BEFORE_1.2.1> sudo apt-mark hold mailserver

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

dnf --showduplicates list mailserver sudo dnf downgrade mailserver-<VERSION_BEFORE_1.2.1> sudo dnf versionlock add mailserver

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.

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-2002-0416?

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

Is CVE-2002-0416 being exploited?

CVE-2002-0416 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-2002-0416 affect?

CVE-2002-0416 affects mailserver. Severity is high (CVSS 10.0). Buffer overflow in SH39 MailServer 1.21 and earlier allows remote attackers to cause a denial of service, and possibly execute arbitrary code, via a long command to the SMTP port.

How urgent is CVE-2002-0416?

Priority 58/100. Critical severity; EPSS top 7%: very likely to be exploited

Related CVEs

CVE-2006-6201 HIGH 7.5 DOWNGRADE DOWNGRADE Heap-based buffer overflow in Borland idsql32.dll 5.1.0.4, as used by RevilloC MailServer; 5.2.0.2 as used by

References

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