---
id: "CVE-2023-1671"
kind: "vulnerability"
aliases: ["CVE-2023-1671"]
title: "A pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "sophos web appliance", "fixed": ["4.3.10.4"], "affected": "< 4.3.10.4", "ecosystem": "vendor"}, {"name": "Sophos Web Appliance", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "self-hosted", "sophos-web-appliance"]
not_affected_if: ["not-running-sophos-web-appliance"]
published_at: "2023-04-04T10:15:07+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-24T00:09:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-1671", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-1671", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# A pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version…

Sophos Web Appliance has a command injection flaw in its warn-proceed handler that lets a remote attacker run code. CISA lists it as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:sophos web appliance affected < 4.3.10.4 fixed 4.3.10.4
- vendor:Sophos Web Appliance affected ? fixed ?

## Fix

Apply the mitigations per Sophos vendor instructions, or discontinue use of the appliance if mitigations are unavailable.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-1671
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2023-1671

## From the sources

Sophos Web Appliance contains a command injection vulnerability in the warn-proceed handler that allows for remote code execution.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_