CVE-2004-2637: The NAT implementation in Zonet ZSR1104WE Wireless Router Runtime Code Version 2.41 converts IP addresses of i

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MEDIUM 6.4DOWNGRADE

CVE-2004-2637 is a medium-severity flaw (CVSS 6.4) affecting zsr1104we wireless router runtime code. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The NAT implementation in Zonet ZSR1104WE Wireless Router Runtime Code Version 2.41 converts IP addresses of inbound connections to the IP address of the router, which allows remote attackers to bypass intended security restrictions.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: zonet

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:10 UTCUpdated Record last modified

zonet zsr1104we wireless router runtime code DOWNGRADE

Affected: 2.41

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.41

1. Check installed version

apt-cache policy zsr1104we-wireless-router-runtime-code || rpm -q zsr1104we-wireless-router-runtime-code || zsr1104we-wireless-router-runtime-code --version

2. No fixed release: DOWNGRADE to a release before 2.41 (Debian / Ubuntu)

apt-cache madison zsr1104we-wireless-router-runtime-code sudo apt install zsr1104we-wireless-router-runtime-code=<VERSION_BEFORE_2.41> sudo apt-mark hold zsr1104we-wireless-router-runtime-code

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

dnf --showduplicates list zsr1104we-wireless-router-runtime-code sudo dnf downgrade zsr1104we-wireless-router-runtime-code-<VERSION_BEFORE_2.41> sudo dnf versionlock add zsr1104we-wireless-router-runtime-code

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-2004-2637?

zsr1104we wireless router runtime code: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2637 being exploited?

CVE-2004-2637 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-2004-2637 affect?

CVE-2004-2637 affects zsr1104we wireless router runtime code. Severity is medium (CVSS 6.4). The NAT implementation in Zonet ZSR1104WE Wireless Router Runtime Code Version 2.41 converts IP addresses of inbound connections to the IP address of the router, which allows remote attackers to bypass intended security restrictions.

How urgent is CVE-2004-2637?

Priority 42/100. No elevated risk signals yet.

References

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