CVE-2006-4505: CRLF injection vulnerability in links.php in NX5Linx 1.0 allows remote attackers to inject arbitrary HTTP head

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HIGH 7.5DOWNGRADE

CVE-2006-4505 is a high-severity flaw (CVSS 7.5) affecting nx5linx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CRLF injection vulnerability in links.php in NX5Linx 1.0 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a CRLF sequence in the url parameter.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Published	2006-08-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nx5

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

Am I affected?

Timeline

2006-08-31 22:04 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

nx5 nx5linx DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy nx5linx || rpm -q nx5linx || nx5linx --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison nx5linx sudo apt install nx5linx=<VERSION_BEFORE_1.0> sudo apt-mark hold nx5linx

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

dnf --showduplicates list nx5linx sudo dnf downgrade nx5linx-<VERSION_BEFORE_1.0> sudo dnf versionlock add nx5linx

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: NX5Linkx 1.0 - 'links.php' HTTP Response Splitting

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-2006-4505?

nx5linx: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-4505 being exploited?

CVE-2006-4505 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-2006-4505 affect?

CVE-2006-4505 affects nx5linx. Severity is high (CVSS 7.5). CRLF injection vulnerability in links.php in NX5Linx 1.0 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a CRLF sequence in the url parameter.

How urgent is CVE-2006-4505?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-4504 HIGH 7.5 DOWNGRADE SQL injection vulnerability in NX5Linx 1.0 allows remote attackers to execute arbitrary SQL commands via the (
CVE-2006-4503 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in link.php in NX5Linx 1.0 allows remote attackers to read arbitrary files v

References

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