# Hetzner: Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component

> Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component. Detected 2026-11-03 by Rewindex: what changed on Hetzner’s status page, with the before/after diff.

Canonical: https://rewindex.com/change/r10115fbf4bb414
Last updated: 2026-11-03T10:03:16Z

**Summary:** _summary pending_
- Kind: Incident update · Label: Normal progress (rule)
- Changed: 2026-11-03 10:03 UTC · Detected: 2026-11-03 10:03 UTC
- [Source: https://status.hetzner.com/incident/54493dac-b3a2-44f0-8d8b-6de8b25d8f17](https://status.hetzner.com/incident/54493dac-b3a2-44f0-8d8b-6de8b25d8f17)
- [Company: Hetzner](https://rewindex.com/company/hetzner.md)
- Versions: before incident\_version:85/54493dac-b3a2-44f0-8d8b-6de8b25d8f17@423437702810 → after incident\_version:85/54493dac-b3a2-44f0-8d8b-6de8b25d8f17@25f4a14b8a19
- Change 5 of 5 for this incident

Incident page (full timeline): [CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component](https://rewindex.com/company/hetzner/incidents/54493dac-b3a2-44f0-8d8b-6de8b25d8f17.md)
## What changed

**1. Added: Update** (investigating) · 2026-10-29 12:34 UTC

```diff
+ What is affected? Dedicated Servers (bare-metal servers) and Cloud VMs running with UEFI. On Linux, you can check this with the following command: [ -d /sys/firmware/efi ] && echo UEFI || echo BIOS What do we recommend? A running system is not directly at risk. For Dedicated Servers, the risk only exists during a reboot. For Cloud VMs, the risk only exists when booting into the Rescue System. If possible, avoid these boot processes until a solution is available. As an additional security measure, you can temporarily block incoming ICMP packets using the Hetzner Firewall during reboots: Dedicated Servers (https://docs.hetzner.com/robot/dedicated-server/firewall/): Please make sure to enable “Allow Hetzner Services” when creating the firewall rules. Cloud Servers: https://docs.hetzner.com/cloud/firewalls/getting-started/creating-a-firewall/ What happens next? We are working on further recommendations and additional security measures. We will inform you as soon as we have new information or updates.
```

**2. Added: Update** (investigating) · 2026-10-30 16:07 UTC

```diff
+ We're implementing filters in our network, which will drop fragmented ICMPv4 packets, as well as ICMPv4 errors larger than 768 bytes. In particular: Any IPv4 packet with protocol ICMP and the "More Fragments (MF)" flag or non-zero "Fragment Offset" will be dropped. We will also drop any ICMPv4 packets that are of type 3 (Destination Unreachable), 4 (Source Quench), 5 (Redirect), 11 (Time Exceeded), or 12 (Parameter Problem), when their IPv4 header has a "Total Length" >= 768 bytes. Our previous recommendations on how to protect your systems still apply.
```

**3. Added: Update** (investigating) · 2026-11-02 13:03 UTC

```diff
+ The network filters described in our last update are now active at our network edge and between our locations. We are completing the rollout of the filters on cloud servers today. For dedicated (BareMetal) servers, we are currently evaluating how to extend these protective measures further within our DC networks. Until then, our previous recommendations still apply, especially for dedicated servers: Please avoid reboots where possible, and if a reboot is necessary, temporarily block incoming ICMP packets using the Hetzner Firewall. We will keep you informed about further progress.
```

**4. Added: Update** (investigating) · 2026-11-03 09:56 UTC

```diff
+ Network filters have already been in place for cloud servers for some time. These protective measures are now fully implemented across our Cloud infrastructure, resolving the issue for Cloud. For dedicated (bare-metal) servers, we are continuing to explore ways to further expand these protective measures within our data center networks.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-29 11:53 UTC | [Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component](https://rewindex.com/change/rd6e4d86fd32334.md) | Normal progress |
| 2026-10-29 12:43 UTC | [Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component](https://rewindex.com/change/r49bf1247b43caa.md) | Normal progress |
| 2026-10-30 16:13 UTC | [Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component](https://rewindex.com/change/r93eb85d76d530d.md) | Normal progress |
| 2026-11-02 13:13 UTC | [Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component](https://rewindex.com/change/r0b67f246d04dcd.md) | Normal progress |
| 2026-11-03 10:03 UTC | Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component (this change) | Normal progress |

Previous: [change](https://rewindex.com/change/r0b67f246d04dcd.md) · All Hetzner changes: [timeline](https://rewindex.com/company/hetzner/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._

## Cite this

Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component on Hetzner’s status page, changed 2026-11-03 10:03 UTC (change 5 of 5).

- Canonical URL: https://rewindex.com/change/r10115fbf4bb414
- Citation: Hetzner, “Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component” (2026-11-03 10:03 UTC). Archived by Rewindex: https://rewindex.com/change/r10115fbf4bb414 (CC BY 4.0).
- Markdown link: `[Hetzner: Incident updated: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component (2026-11-03)](https://rewindex.com/change/r10115fbf4bb414)`


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Canonical: https://rewindex.com/change/r10115fbf4bb414 · Markdown: https://rewindex.com/change/r10115fbf4bb414.md · JSON: https://rewindex.com/api/v1/changes/r10115fbf4bb414 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:38:52.706Z