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ExploitedIn CISA KEVFix available

CVE-2023-1671

Exploitation confirmed. First attested on 2023-10-14 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2023-04-04
  • Fixed in4.3.10.4
  • WeaknessCWE-77

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-04-0410:15CVE publishedNVD
  2. 2023-04-25Exploit-DB entryExploit-DB
  3. 2023-10-1414:57Listed as exploited by GCVEGCVE
  4. 2023-10-1414:57Exploitation first reportedGCVE
  5. 2023-11-16Added to the CISA KEV catalogCISA KEV
  6. 2025-01-2821:14SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-1671?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-1671?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Sophos web appliance
BranchAffectedFixed in
4.3< 4.3.10.44.3.10.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Sophos, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Sophos Web Appliance
    Affected
    • < 4.3.10.4fixed in 4.3.10.4custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-04-26

Fix

  1. Update Sophos web appliance to 4.3.10.4
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2023-12-07

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-51396
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedohnonoyesyes/CVE-2023-1671W01fh4cker/CVE-2023-1671-POCcsffs/cve-2023-1671
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-11-16
Patch Due Date
2023-12-07
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-04-04
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-5f37-m2hf-qphr

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.

Is CVE-2023-1671 actively exploited?

Yes. CVE-2023-1671 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-12-07.

What is the CVSS score for CVE-2023-1671?

CVE-2023-1671 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record