CVE-2005-0491: Stack-based buffer overflow in Knox Arkeia Server Backup 5.3.x allows remote attackers to execute arbitrary co

This week

HIGH 10.0DOWNGRADE

CVE-2005-0491 is a high-severity flaw (CVSS 10.0) affecting arkeia server backup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in Knox Arkeia Server Backup 5.3.x allows remote attackers to execute arbitrary code via a long type 77 request.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	64.9% (top 1%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: knox software

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

Am I affected?

Timeline

2005-05-02 04:00 UTCPublished CVE record published
2026-06-16 22:11 UTCUpdated Record last modified

knox software arkeia server backup DOWNGRADE

Affected: 5.3.0 · 5.3.0_rc1 · 5.3.0_rc2 · 5.3.0_rc3 · 5.3.0_rc4 · 5.3.1 · 5.3.2 · 5.3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3.0

1. Check installed version

apt-cache policy arkeia-server-backup || rpm -q arkeia-server-backup || arkeia-server-backup --version

2. No fixed release: DOWNGRADE to a release before 5.3.0 (Debian / Ubuntu)

apt-cache madison arkeia-server-backup sudo apt install arkeia-server-backup=<VERSION_BEFORE_5.3.0> sudo apt-mark hold arkeia-server-backup

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

dnf --showduplicates list arkeia-server-backup sudo dnf downgrade arkeia-server-backup-<VERSION_BEFORE_5.3.0> sudo dnf versionlock add arkeia-server-backup

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.

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: Knox Arkeia Pro 5.1.12 - Backup Remote Code Execution
Exploit-DB: Knox Arkeia Server Backup 5.3.x - Remote Code Execution
Exploit-DB: Knox Arkeia Backup Client 5.3.3 Type 77 (OSX) - Overflow (Metasploit)
Exploit-DB: Knox Arkeia Backup Client Type 77 (OSX) - Remote Overflow (Metasploit)
Exploit-DB: Knox Arkeia Backup Client Type 77 (Windows x86) - Remote Overflow (Metasploit)
Metasploit: Arkeia Backup Client Type 77 Overflow (Mac OS X)
Metasploit: Arkeia Backup Client Type 77 Overflow (Win32)

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-2005-0491?

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

Is CVE-2005-0491 being exploited?

CVE-2005-0491 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-2005-0491 affect?

CVE-2005-0491 affects arkeia server backup. Severity is high (CVSS 10.0). Stack-based buffer overflow in Knox Arkeia Server Backup 5.3.x allows remote attackers to execute arbitrary code via a long type 77 request.

How urgent is CVE-2005-0491?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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