CVE-2008-6916: Siemens SpeedStream 5200 with NetPort Software 1.1 allows remote attackers to bypass authentication via an inv

This week

HIGH 10.0MITIGATEDOWNGRADE

CVE-2008-6916 is a high-severity flaw (CVSS 10.0) affecting speedstream 5200, netport software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Siemens SpeedStream 5200 with NetPort Software 1.1 allows remote attackers to bypass authentication via an invalid Host header, possibly involving a trailing dot in the hostname.

Why this priority

Critical severity
EPSS top 9%: 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	4.3% (top 9%)
CISA exploited list	No
Weakness	CWE-287
Published	2009-08-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: john doe · siemens

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

Am I affected?

Timeline

2009-08-07 19:00 UTCPublished CVE record published
2026-06-16 23:03 UTCUpdated Record last modified

siemens speedstream 5200 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

john doe netport software DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy netport-software || rpm -q netport-software || netport-software --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison netport-software sudo apt install netport-software=<VERSION_BEFORE_1.1> sudo apt-mark hold netport-software

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

dnf --showduplicates list netport-software sudo dnf downgrade netport-software-<VERSION_BEFORE_1.1> sudo dnf versionlock add netport-software

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: SpeedStream 5200 - Authentication Bypass Configuration Download

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-2008-6916?

speedstream 5200: mitigate or apply the listed mitigation; netport software: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-6916 being exploited?

CVE-2008-6916 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-2008-6916 affect?

CVE-2008-6916 affects speedstream 5200, netport software. Severity is high (CVSS 10.0). Siemens SpeedStream 5200 with NetPort Software 1.1 allows remote attackers to bypass authentication via an invalid Host header, possibly involving a trailing dot in the hostname.

How urgent is CVE-2008-6916?

Priority 63/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference

Software pages

Siemens vulnerabilities

References

← Back to latest CVEs