CVE-2004-1027: Directory traversal vulnerability in the -x (extract) command line option in unarj allows remote attackers to

This month

MEDIUM 5.0WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2004-1027 is a medium-severity flaw (CVSS 5.0) affecting unarj, linux, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in the -x (extract) command line option in unarj allows remote attackers to overwrite arbitrary files via an arj archive with filenames that contain .. (dot dot) sequences.

Why this priority

On your watchlist

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Published	2005-03-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: arjsoftware · debian · gentoo

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

Am I affected?

Timeline

2005-03-01 05:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

arjsoftware unarj DOWNGRADE

Affected: 2.62 · 2.63 a · 2.64 · 2.65

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.62

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.62 (Debian / Ubuntu)

apt-cache madison unarj sudo apt install unarj=<VERSION_BEFORE_2.62> sudo apt-mark hold unarj

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

dnf --showduplicates list unarj sudo dnf downgrade unarj-<VERSION_BEFORE_2.62> sudo dnf versionlock add unarj

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.

gentoo linux MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

debian debian linux MITIGATE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2004-1027?

unarj: downgrade or apply the listed mitigation; linux: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-1027 being exploited?

CVE-2004-1027 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-2004-1027 affect?

CVE-2004-1027 affects unarj, linux, debian linux. Severity is medium (CVSS 5.0). Directory traversal vulnerability in the -x (extract) command line option in unarj allows remote attackers to overwrite arbitrary files via an arj archive with filenames that contain .. (dot dot) sequences.

How urgent is CVE-2004-1027?

Priority 45/100. On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2004-0947 HIGH 10.0 DOWNGRADE MITIGATE Buffer overflow in unarj before 2.63a-r2 allows remote attackers to execute arbitrary code via an arj archive

References

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