CVE-2001-0280: Buffer overflow in MERCUR SMTP server 3.30 allows remote attackers to execute arbitrary commands via a long EX

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HIGH 10.0MITIGATE

CVE-2001-0280 is a high-severity flaw (CVSS 10.0) affecting mercur. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in MERCUR SMTP server 3.30 allows remote attackers to execute arbitrary commands via a long EXPN command.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	13.0% (top 4%)
CISA exploited list	No
Published	2001-05-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: atrium software

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

Am I affected?

Timeline

2001-05-03 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

atrium software mercur MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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: Atrium Software Mercur Mail Server 3.3 - EXPN Buffer Overflow

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-2001-0280?

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

Is CVE-2001-0280 being exploited?

CVE-2001-0280 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-2001-0280 affect?

CVE-2001-0280 affects mercur. Severity is high (CVSS 10.0). Buffer overflow in MERCUR SMTP server 3.30 allows remote attackers to execute arbitrary commands via a long EXPN command.

How urgent is CVE-2001-0280?

Priority 64/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference

References

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