Sophos Web Appliance Command Injection Vulnerability
Sophos — Sophos Web Appliance
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.
9.8
100.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Apr 4, 2023
- Modified
- Oct 21, 2025
- Added to KEV
- Nov 16, 2023
- Federal patch due
- Dec 7, 2023
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
4 foundWeaponization
Public repositories whose name or description references CVE-2023-1671, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- W01fh4cker/CVE-2023-1671-POC★ 15
CVE-2023-1671-POC, based on dnslog platform
updated Sep 30, 2026
- ohnonoyesyes/CVE-2023-1671★ 3
Pre-Auth RCE in Sophos Web Appliance
updated May 13, 2026
- behnamvanda/CVE-2023-1671★ 1
Sophos Web Appliance pre-auth command injection Vulnerability Scanner
updated May 6, 2024
- csffs/cve-2023-1671★ 0
Exploit to cve-2023-1671. So there is a test and exploitation function. The test sends a ping request to the dnslog domain from the vulnerable site. If the ping passes, the vulnerability exists, if it doesn't, then cve-2023-1671 is missing. The exploit function, on the other hand, sends a request with your command to the server.
updated May 17, 2023
References
Frequently asked questions
What is CVE-2023-1671?
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.
How severe is CVE-2023-1671?
CVE-2023-1671 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2023-1671 actively exploited in the wild?
Yes. CVE-2023-1671 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Nov 16, 2023, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2023-1671?
100.0% - meaning FIRST.org's EPSS model estimates a 100.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2023-1671?
Yes - a public Nuclei template referencing CVE-2023-1671 exist in public repositories we checked. We also found 4 public GitHub repositories referencing this CVE.
What type of vulnerability is CVE-2023-1671?
CVE-2023-1671 is classified under CWE-77 (CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')).
Cross-checked against
Impactr finds and proves whether CVE-2023-1671 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.