CVE-2023-1671

Sophos Web Appliance Command Injection Vulnerability

Critical 9.8
Exploited: added to CISA KEV 16 Nov 2023

Description

A pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version 4.3.10.4 allows execution of arbitrary code.

Key facts

Published: 4 Apr 2023
Last changed: 21 Oct 2025
Assigned by: Sophos
KEV added: 16 Nov 2023
KEV fix due: 7 Dec 2023
EPSS: 99.999% likely to be exploited in the next 30 days, higher than 99.992% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

9.8CVSS 3.1, Criticalfrom the CNA (Sophos)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

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

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
Sophos	Sophos Web Appliance	unspecified up to but excluding 4.3.10.4 (affected)