Critical 9.8Known exploited (CISA KEV)Published Apr 4, 2023

CVE-2023-1671A 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.

Updated under an hour ago (2026-10-19 08:50 UTC)

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It affects Sophos Web Appliance. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 16, 2023; federal agencies had to remediate by Dec 7, 2023. Treat that date as your deadline.

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-77
Known exploited: Added to CISA KEV Nov 16, 2023; federal remediation due Dec 7, 2023Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 100.00% (percentile 100)
Assigned by: Sophos
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Sophos Sophos Web Appliance sophos:web_appliance (from the name)	from unspecified before 4.3.10.4	CNA record
sophos web_appliance sophos:web_appliance	before 4.3.10.4	NVD

References

https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rcevendor-advisory
http://packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-Command-Injection.htmlexploit, third-party-advisory, vdb-entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-1671us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.