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Vulnerabilities

Vulnerability · CVE-2023-1671

Sophos Web Appliance Command Injection Vulnerability

Published Apr 4, 2023 · catalog updated Jun 16, 2026 · Sophos Web Appliance

Patch now

CVE-2023-1671 is in the CISA known-exploited catalog, due Dec 7, 2023. Confirm Sophos Web Appliance against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
100.00%
Remediation
Remediation guidance
Affected products
cpe sophos/web appliance · vendor Sophos Web Appliance

Sophos Web Appliance contains a command injection vulnerability in the warn-proceed handler that allows for remote code execution. VulnCheck canary evidence. Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe sophos/web applianceversion unspecified
  • vendor Sophos Web Applianceversion unspecified

How to fix CVE-2023-1671

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2023-1671 is in the CISA known-exploited catalog, due Dec 7, 2023. Confirm Sophos Web Appliance against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-77: Command Injection. EPSS 100.00%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 4, 2023 · Catalog

    Detected

    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.

  2. Nov 16, 2023 · CISA KEV

    Known exploited

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

  3. Dec 7, 2023 · CISA KEV

    Remediation due

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

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2023-1671

    Sophos Web Appliance contains a command injection vulnerability in the warn-proceed handler that allows for remote code execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2023-1671

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-1671

    30-day exploitation probability 100.0%

    first.org
  • Exploit DatabasePublic exploit reference51396

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-Command-Injection.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2023-1671

    Sophos Web Appliance contains a command injection vulnerability in the warn-proceed handler that allows for remote code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.