---
title: "Synnovis / NHS (London hospitals) security incident"
description: "What the retained public evidence establishes about the Synnovis / NHS (London hospitals) incident, its attack path, impact, and response."
incident_type: "Cybersecurity incident"
status: "active"
last_modified: "2026-09-19"
canonical_url: "https://www.ally.security/incidents/synnovis-nhs-london-hospitals-security-incident-2024"
markdown_url: "https://www.ally.security/incidents/synnovis-nhs-london-hospitals-security-incident-2024.md"
stix_url: "https://www.ally.security/incidents/synnovis-nhs-london-hospitals-security-incident-2024/stix.json"
---

# Synnovis / NHS (London hospitals) security incident

Synnovis was hit by a ransomware attack on June 3, 2024. The attack sharply reduced pathology testing capacity in south-east London and forced hospitals to postpone operations and outpatient appointments.

Last modified Sep 19, 2026 · 1 source

## Summary

- **Environment:** Pathology lab services / NHS (UK)
- **Operational impact:** The attack sharply reduced pathology testing capacity in south-east London and forced hospitals to postpone operations and outpatient appointments.
- **Financial impact:** No financial figure is established by the reviewed source evidence

## What happened

In 2024, Synnovis experienced an incident in its pathology lab services / nhs (uk) environment. The retained source describes the attack path as follows: Synnovis was hit by a ransomware attack on June 3, 2024. [1](#source-1)

The documented consequence was: The attack sharply reduced pathology testing capacity in south-east London and forced hospitals to postpone operations and outpatient appointments. [1](#source-1)

## Impact

- Documented impact: The attack sharply reduced pathology testing capacity in south-east London and forced hospitals to postpone operations and outpatient appointments. [1](#source-1)
- No financial loss, ransom amount, recovery cost, or regulatory penalty is established by the reviewed source evidence.

## Timeline

### June 3, 2024 — Documented public update

The [Synnovis cyber incident – public questions and answers](https://www.england.nhs.uk/synnovis-cyber-incident/questions-and-answers/) records the incident facts used in this briefing. [1](#source-1)

### September 19, 2026 — Briefing updated

This briefing was last reviewed and updated on September 19, 2026.

## Threat Group & Attack Vector

The retained source describes the attack path as follows: Synnovis was hit by a ransomware attack on June 3, 2024. The canonical record does not add intrusion steps beyond those supported by the source. [1](#source-1)

### Actors

- No threat actor group has been identified in the reviewed public evidence.

### TTPs

- [T1486 — Data Encrypted for Impact](https://attack.mitre.org/techniques/T1486/) — mapped from the cited behavior. [1](#source-1)

## Response

NHS England coordinated mutual aid, rerouted tests, and worked with Synnovis while laboratory systems were rebuilt. [1](#source-1)

This account is bounded to [Synnovis cyber incident – public questions and answers](https://www.england.nhs.uk/synnovis-cyber-incident/questions-and-answers/). Details absent from that evidence are left unresolved rather than inferred. [1](#source-1)

## Assets

[Download the case-scoped STIX 2.1 bundle](<https://www.ally.security/incidents/synnovis-nhs-london-hospitals-security-incident-2024/stix.json>)

## Sources

Primary source records used to research this incident.

<a id="source-1"></a>

### Synnovis cyber incident – public questions and answers

official · NHS England

<https://www.england.nhs.uk/synnovis-cyber-incident/questions-and-answers/>

<details>
<summary>Evidence ledger</summary>

Review the supporting structured claims.

1. **Resulted In · 95% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: The attack sharply reduced pathology testing capacity in south-east London and forced hospitals to postpone operations and outpatient appointments.
2. **Resulted In · 95% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: NHS England coordinated mutual aid, rerouted tests, and worked with Synnovis while laboratory systems were rebuilt.
3. **Resulted In · 100% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: The reviewed source documents the synnovis / nhs (london hospitals) security incident involving Synnovis, National Health Service.
4. **Affected Organization · 100% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: Synnovis
5. **Occurred At · 100% confidence · current**  
   Documented public update: 2024-06-03
6. **Resulted In · 95% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: Synnovis was hit by a ransomware attack on June 3, 2024.
7. **Affected Organization · 100% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: National Health Service
8. **Used Attack Technique · 90% confidence · current**  
   Synnovis / NHS (London hospitals) security incident: https://attack.mitre.org/techniques/T1486/

</details>