CVE-2006-2107: Buffer overflow in BL4 SMTP Server 0.1.4 and earlier allows remote attackers to cause a denial of service (cra

Q: How do I fix CVE-2006-2107?

smtp server: upgrade to newer than 0.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2006-2107 being exploited?

CVE-2006-2107 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-2006-2107 affect?

CVE-2006-2107 affects smtp server. Severity is high (CVSS 7.5). Buffer overflow in BL4 SMTP Server 0.1.4 and earlier allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a long argument to the (1) EHLO, (2) MAIL FROM, and (3) RCPT TO commands.

Q: How urgent is CVE-2006-2107?

Priority 54/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference

This month

HIGH 7.5UPGRADE

CVE-2006-2107 is a high-severity flaw (CVSS 7.5) affecting smtp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in BL4 SMTP Server 0.1.4 and earlier allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a long argument to the (1) EHLO, (2) MAIL FROM, and (3) RCPT TO commands.

Why this priority

High severity
EPSS top 8%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	5.0% (top 8%)
CISA exploited list	No
Published	2006-04-29
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bl4

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

Am I affected?

Timeline

2006-04-29 10:02 UTCPublished CVE record published
2026-06-16 22:24 UTCUpdated Record last modified

bl4 smtp server UPGRADE

Affected: <= 0.1.4

Fixed in: newer than 0.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.1.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade smtp-server

Note

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

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: BL4 SMTP Server < 0.1.5 - Remote Buffer Overflow (PoC)

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-2006-2107?

smtp server: upgrade to newer than 0.1.4. Exact commands for each OS are on this page.

Is CVE-2006-2107 being exploited?

CVE-2006-2107 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-2006-2107 affect?

CVE-2006-2107 affects smtp server. Severity is high (CVSS 7.5). Buffer overflow in BL4 SMTP Server 0.1.4 and earlier allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a long argument to the (1) EHLO, (2) MAIL FROM, and (3) RCPT TO commands.

How urgent is CVE-2006-2107?

Priority 54/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2006-0447 HIGH 7.5 DOWNGRADE DOWNGRADE Multiple buffer overflows in E-Post Mail Server 4.10 and SPA-PRO Mail @Solomon 4.00 allow remote attackers to

References

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