CVE-2023-1671
Confirmed PUBLISHEDA pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version 4.3.10.4 allows execution of...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Apr 04, 2023
- Exploitation Reported
- Nov 16, 2023
- CVSS
- 9.8 Critical
- EPSS
- 100.0%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Sophos |
Sophos Web Appliance
|
unspecified to < 4.3.10.4 |
Affected |
CVE References
- sophos.com/en-us/security-advisories/sophos-sa-20230404... sophos.com · CVE Record https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-s...
- packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-C... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3....
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2023-11-16 00:00 UTC |
| The Shadowserver | 2026-07-08 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-1671.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2023-11-16 00:00:00 UTC · CISA
Proof of concept available
Recorded 2023-04-23 02:58:17 UTC · GitHub
Weaknesses (CWE)
-
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-1671.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2023-04-24 15:53:42 UTC · 17 stars
CVE-2023-1671-POC, based on dnslog platform
github · Created 2023-04-23 02:58:17 UTC · 5 stars
Pre-Auth RCE in Sophos Web Appliance
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 11 days ago00:00 UTC · 11 days ago
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
00:00 UTC over 2 years ago00:00 UTC · over 2 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
02:58 UTC about 3 years ago02:58 UTC · about 3 years ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC over 3 years ago00:00 UTC · over 3 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 3 years ago00:00 UTC · over 3 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2023-1671
{
"cve_id": "CVE-2023-1671",
"title": "A pre-auth command injection vulnerability in the warn-proceed handler of Sop...",
"affected_vendor": "Sophos",
"affected_product": "Sophos Web Appliance",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": 0.99999,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}