CVE-2005-3381: Multiple interpretation error in Ukrainian National Antivirus (UNA) 1.83.2.16 with kernel 265 allows remote at

Routine

MEDIUM 5.0DOWNGRADE

CVE-2005-3381 is a medium-severity flaw (CVSS 5.0) affecting una. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple interpretation error in Ukrainian National Antivirus (UNA) 1.83.2.16 with kernel 265 allows remote attackers to bypass virus scanning via a file such as BAT, HTML, and EML with an "MZ" magic byte sequence which is normally associated with EXE, which causes the file to be treated as a safe type that could still be executed as a dangerous file type by applications on the end system, as demonstrated by a "triple headed" program that contain

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	2.1% (top 18%)
CISA exploited list	No
Published	2005-10-30
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ukranian national antivirus

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

Am I affected?

Timeline

2005-10-30 14:34 UTCPublished CVE record published
2026-06-16 22:16 UTCUpdated Record last modified

ukranian national antivirus una DOWNGRADE

Affected: 1.83.2.16

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.83.2.16

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.83.2.16 (Debian / Ubuntu)

apt-cache madison una sudo apt install una=<VERSION_BEFORE_1.83.2.16> sudo apt-mark hold una

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

dnf --showduplicates list una sudo dnf downgrade una-<VERSION_BEFORE_1.83.2.16> sudo dnf versionlock add una

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-2005-3381?

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

Is CVE-2005-3381 being exploited?

CVE-2005-3381 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-2005-3381 affect?

CVE-2005-3381 affects una. Severity is medium (CVSS 5.0). Multiple interpretation error in Ukrainian National Antivirus (UNA) 1.83.2.16 with kernel 265 allows remote attackers to bypass virus scanning via a file such as BAT, HTML, and EML with an "MZ" magic byte sequence which is normally associat

How urgent is CVE-2005-3381?

Priority 38/100. No elevated risk signals yet.

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References

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