CVE-2001-0776: Buffer overflow in DynFX MailServer version 2.10 allows remote attackers to conduct a denial of service via a

Routine

MEDIUM 5.0DOWNGRADE

CVE-2001-0776 is a medium-severity flaw (CVSS 5.0) affecting dynfx mailserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in DynFX MailServer version 2.10 allows remote attackers to conduct a denial of service via a long username to the POP3 service.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Published	2001-10-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: dynfx

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

Am I affected?

Timeline

2001-10-18 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

dynfx dynfx mailserver DOWNGRADE

Affected: 2.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.10

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.10 (Debian / Ubuntu)

apt-cache madison dynfx-mailserver sudo apt install dynfx-mailserver=<VERSION_BEFORE_2.10> sudo apt-mark hold dynfx-mailserver

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

dnf --showduplicates list dynfx-mailserver sudo dnf downgrade dynfx-mailserver-<VERSION_BEFORE_2.10> sudo dnf versionlock add dynfx-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-2001-0776?

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

Is CVE-2001-0776 being exploited?

CVE-2001-0776 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-2001-0776 affect?

CVE-2001-0776 affects dynfx mailserver. Severity is medium (CVSS 5.0). Buffer overflow in DynFX MailServer version 2.10 allows remote attackers to conduct a denial of service via a long username to the POP3 service.

How urgent is CVE-2001-0776?

Priority 37/100. No elevated risk signals yet.

References

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