CVE-2005-3027: Sybari Antigen 8.0 SR2 does not properly filter SMTP messages, which allows remote attackers to bypass custom

Routine

MEDIUM 5.0DOWNGRADE

CVE-2005-3027 is a medium-severity flaw (CVSS 5.0) affecting antigen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sybari Antigen 8.0 SR2 does not properly filter SMTP messages, which allows remote attackers to bypass custom filter rules and send file attachments of arbitrary file types via a message with a subject of "Antigen forwarded attachment".

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	1.5% (top 25%)
CISA exploited list	No
Published	2005-09-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: sybari

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

Am I affected?

Timeline

2005-09-21 22:03 UTCPublished CVE record published
2026-06-16 22:16 UTCUpdated Record last modified

sybari antigen DOWNGRADE

Affected: 8.0 sr2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)

apt-cache madison antigen sudo apt install antigen=<VERSION_BEFORE_8.0> sudo apt-mark hold antigen

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

dnf --showduplicates list antigen sudo dnf downgrade antigen-<VERSION_BEFORE_8.0> sudo dnf versionlock add antigen

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-2005-3027?

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

Is CVE-2005-3027 being exploited?

CVE-2005-3027 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-2005-3027 affect?

CVE-2005-3027 affects antigen. Severity is medium (CVSS 5.0). Sybari Antigen 8.0 SR2 does not properly filter SMTP messages, which allows remote attackers to bypass custom filter rules and send file attachments of arbitrary file types via a message with a subject of "Antigen forwarded attachment".

How urgent is CVE-2005-3027?

Priority 36/100. No elevated risk signals yet.

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References

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