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critical severity September 08, 2026 · 1 min read

CISA ICS Advisory: Siemens Reyrolle 7SR5

Here’s what this advisory affects, and what to do about it.

Siemens Reyrolle 7SR5 Before V2.70 is affected by multiple vulnerabilities. Siemens has released a new version for Reyrolle 7SR5 and recommends to update to the latest version.

CISA ICS Advisory: Siemens Reyrolle 7SR5

CISA has published an ICS advisory on September 15, 2026, warning that Siemens Reyrolle 7SR5 devices running firmware versions before V2.70 contain multiple vulnerabilities.

Multiple vulnerabilities in protection relays

The advisory states that Siemens Reyrolle 7SR5 devices prior to version V2.70 are affected by several security flaws. Successful exploitation of these vulnerabilities could allow an attacker to impact the intended operation of the affected protection relays. The advisory does not say whether any of the vulnerabilities have been exploited in the wild.

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Affected products

The advisory names Siemens Reyrolle 7SR5 protection relays running firmware before V2.70. No other products or specific sectors are listed as affected. Siemens has developed and released a fixed version.

What to do

  • Determine whether any Reyrolle 7SR5 devices in your environment are running firmware before V2.70.
  • Update affected Reyrolle 7SR5 devices to the latest firmware version released by Siemens.
  • Follow Siemens’ recommended mitigation guidance published with the update.
  • Monitor Siemens’ official product security channel for any additional information or future updates.
  • Apply network segmentation and access controls consistent with ICS best practices to limit exposure of the relays.

Organisations operating industrial control systems should treat vendor-issued firmware updates for protection relays as high priority when CISA publishes an advisory.

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Sources: CISA ICS Advisory
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