---
title: "Security digest: October 7, 2025"
url: https://erroneo.us/security/2025-10-07/
description: "October 7, 2025 vulnerability digest: 1 CISA KEV addition (Synacor); 1 critical advisory (NuGet). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2025-10-07
date_modified: 2025-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: October 7, 2025

1 known exploited (cisa kev) addition and 1 critical advisory.

## Take stock

- Do you run any of these? Synacor Zimbra Collaboration Suite (ZCS). They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2025-10-28.
- NuGet: 1 critical advisory ( Akka.Remote , Akka.Cluster ). Check with dotnet list package --vulnerable --include-transitive .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Known exploited (CISA KEV)

- [CVE-2025-27915](https://erroneo.us/security/cve/CVE-2025-27915/index.md) Synacor Zimbra Collaboration Suite (ZCS): Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability (CISA due 2025-10-28)

## Critical advisories

- [CVE-2025-61778](https://erroneo.us/security/cve/CVE-2025-61778/index.md) Akka.Remote TLS did not properly implement certificate-based authentication — NuGet Akka.Remote >= 1.2.0, < 1.5.52 → 1.5.52; NuGet Akka.Cluster >= 1.2.0, < 1.5.52 → 1.5.52

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Source page: https://erroneo.us/security/2025-10-07/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt