CVE-2006-6405: BitDefender Mail Protection for SMB 2.0 allows remote attackers to bypass virus detection by inserting invalid

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MEDIUM 5.0DOWNGRADE

CVE-2006-6405 is a medium-severity flaw (CVSS 5.0) affecting bitdefender mail protection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BitDefender Mail Protection for SMB 2.0 allows remote attackers to bypass virus detection by inserting invalid characters into base64 encoded content in a multipart/mixed MIME file, as demonstrated with the EICAR test file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2006-12-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: softwin

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

Am I affected?

Timeline

2006-12-10 02:28 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

softwin bitdefender mail protection DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy bitdefender-mail-protection || rpm -q bitdefender-mail-protection || bitdefender-mail-protection --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison bitdefender-mail-protection sudo apt install bitdefender-mail-protection=<VERSION_BEFORE_2.0> sudo apt-mark hold bitdefender-mail-protection

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

dnf --showduplicates list bitdefender-mail-protection sudo dnf downgrade bitdefender-mail-protection-<VERSION_BEFORE_2.0> sudo dnf versionlock add bitdefender-mail-protection

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-2006-6405?

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

Is CVE-2006-6405 being exploited?

CVE-2006-6405 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-2006-6405 affect?

CVE-2006-6405 affects bitdefender mail protection. Severity is medium (CVSS 5.0). BitDefender Mail Protection for SMB 2.0 allows remote attackers to bypass virus detection by inserting invalid characters into base64 encoded content in a multipart/mixed MIME file, as demonstrated with the EICAR test file.

How urgent is CVE-2006-6405?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2006-6627 HIGH 10.0 DOWNGRADE DOWNGRADE Integer overflow in the packed PE file parsing implementation in BitDefender products before 20060829, includi

References

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