CVE-2008-3494: 8e6 R3000 Internet Filter 2.0.12.10 allows remote attackers to bypass intended restrictions via an extra HTTP

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HIGH 7.8DOWNGRADE

CVE-2008-3494 is a high-severity flaw (CVSS 7.8) affecting r3000 internet filter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

8e6 R3000 Internet Filter 2.0.12.10 allows remote attackers to bypass intended restrictions via an extra HTTP Host header with additional leading text placed before the real Host header.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Weakness	CWE-264
Published	2008-08-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: 8e6

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

Am I affected?

Timeline

2008-08-06 18:41 UTCPublished CVE record published
2026-06-16 22:55 UTCUpdated Record last modified

8e6 r3000 internet filter DOWNGRADE

Affected: 2.0.12.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.12.10

1. Check installed version

apt-cache policy r3000-internet-filter || rpm -q r3000-internet-filter || r3000-internet-filter --version

2. No fixed release: DOWNGRADE to a release before 2.0.12.10 (Debian / Ubuntu)

apt-cache madison r3000-internet-filter sudo apt install r3000-internet-filter=<VERSION_BEFORE_2.0.12.10> sudo apt-mark hold r3000-internet-filter

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

dnf --showduplicates list r3000-internet-filter sudo dnf downgrade r3000-internet-filter-<VERSION_BEFORE_2.0.12.10> sudo dnf versionlock add r3000-internet-filter

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: 8E6 Technologies R3000 - Host Header Internet Filter Security Bypass

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-2008-3494?

r3000 internet filter: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-3494 being exploited?

CVE-2008-3494 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-2008-3494 affect?

CVE-2008-3494 affects r3000 internet filter. Severity is high (CVSS 7.8). 8e6 R3000 Internet Filter 2.0.12.10 allows remote attackers to bypass intended restrictions via an extra HTTP Host header with additional leading text placed before the real Host header.

How urgent is CVE-2008-3494?

Priority 54/100. High severity; Public exploit reference

Related CVEs

CVE-2008-0372 MEDIUM 5.0 UPGRADE 8e6 R3000 Internet Filter 2.0.05.33, and other versions before 2.0.11, allows remote attackers to bypass inten
CVE-2007-2970 MEDIUM 4.3 MITIGATE Multiple cross-site scripting (XSS) vulnerabilities in cgi/block.cgi in 8e6 R3000 Internet Filter allow remote

References

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