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CVE-2023-1671

9.8, critical Known exploited

Sophos Web Appliance Command Injection Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
100% higher than 99.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
4 Apr 20233 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 16 Nov 2023. US federal agencies had to remediate by 7 Dec 2023, a deadline that has passed.

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

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.

Details

Vendor
Sophos
Product
Sophos Web Appliance
Weakness
CWE-77 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
security-alert@sophos.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 3

Exploit code 1

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Sophos CVEs

Every Sophos CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2022-3236 Sophos Firewall Code Injection Vulnerability KEV EPSS 99% 9.8, critical
  • CVE-2022-1040 Sophos Firewall Authentication Bypass Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2020-29574 CyberoamOS (CROS) SQL Injection Vulnerability KEV EPSS 5% 9.8, critical
  • CVE-2020-25223 Sophos SG UTM Remote Code Execution Vulnerability KEV EPSS 97% 9.8, critical
  • CVE-2020-15069 Sophos XG Firewall Buffer Overflow Vulnerability KEV EPSS 11% 9.8, critical
  • CVE-2020-12271 Sophos SFOS SQL Injection Vulnerability KEV EPSS 42% 9.8, critical

Beyond this page

Is CVE-2023-1671 in your network?

This page tells you how dangerous CVE-2023-1671 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2023-1671 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2023-1671 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.