CVE-2013-5709

What it is

The authentication implementation in the web server on Siemens SCALANCE X-200 switches with firmware before 5.0.0 does not use a sufficient source of entropy for generating values of random numbers, which makes it easier for remote attackers to hijack sessions by predicting a value.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

3.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2013-09-17 12:04 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:59 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.0% in the next 30 days (EPSS).
• Severity: 8.3 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2013-09-17 12:04 UTC

Last modified

2026-06-16 23:59 UTC

Exploit probability

3.0% · EPSS, next 30 days

Weakness

CWE-189

Record status

Modified

Affected

• Siemens Scalance x-200 Series Firmware ≤ 4.4
• Siemens Scalance x-200 Series Firmware 4.3
• Siemens Scalance x-200
• Siemens Scalance x-200rna
• Siemens Scalance x200-4p Irt
• Siemens Scalance x201-3p Irt
• Siemens Scalance x202-2irt
• Siemens Scalance x202-2p Irt

Attack profile CVSS 2.0 · 8.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Complete

Is it in your code?

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