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.
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Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-11-16), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.
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.
April 4, 2023
October 27, 2025
Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-1671MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (2 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Sophos Web Appliance 4.3.10.4 - Pre-auth command injection
Open source ↗CVE-2023-1671-POC, based on dnslog platform
Open source ↗Pre-Auth RCE in Sophos Web Appliance
Open source ↗Sophos Web Appliance - Remote Code Execution
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-1671
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.
CWE-77