CVE-2005-0809: NotifyLink, when configured for client key retrieval, allows remote attackers to obtain AES keys via a direct

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HIGH 7.5DOWNGRADE

CVE-2005-0809 is a high-severity flaw (CVSS 7.5) affecting notifylink. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NotifyLink, when configured for client key retrieval, allows remote attackers to obtain AES keys via a direct request to /hwp/get.asp, then uses a weak encryption scheme (fixed byte reordering) to protect the key, which allows remote attackers to obtain the key via a brute force attack.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: notify technology

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

notify technology notifylink DOWNGRADE

Affected: enterprise_server

Fixed in: no fixed release known

Safe to downgrade to: a release before enterprise_server

1. Check installed version

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

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

apt-cache madison notifylink sudo apt install notifylink=<VERSION_BEFORE_enterprise_server> sudo apt-mark hold notifylink

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

dnf --showduplicates list notifylink sudo dnf downgrade notifylink-<VERSION_BEFORE_enterprise_server> sudo dnf versionlock add notifylink

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-2005-0809?

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

Is CVE-2005-0809 being exploited?

CVE-2005-0809 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-2005-0809 affect?

CVE-2005-0809 affects notifylink. Severity is high (CVSS 7.5). NotifyLink, when configured for client key retrieval, allows remote attackers to obtain AES keys via a direct request to /hwp/get.asp, then uses a weak encryption scheme (fixed byte reordering) to protect the key, which allows remote attack

How urgent is CVE-2005-0809?

Priority 43/100. High severity

Related CVEs

CVE-2005-0812 MEDIUM 5.0 DOWNGRADE The web interface in NotifyLink 3.0 displays passwords in cleartext on the administrative page, which could al
CVE-2005-0811 MEDIUM 4.6 DOWNGRADE The web interface in NotifyLink 3.0 does not properly restrict access to functions that have been disabled in
CVE-2005-0810 HIGH 7.5 DOWNGRADE SQL injection vulnerability in NotifyLink before 3.0 allows remote attackers to execute arbitrary SQL commands

References

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