What is CVE-2023-1671?

CVE-2023-1671 is a critical-severity vulnerability in Sophos Web Appliance. CVSS score: 9.8/10. Published 2023-04-04.

How severe is CVE-2023-1671?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-1671 known to be exploited?

Yes. CVE-2023-1671 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-16), indicating it is being actively exploited. 15 public proof-of-concept repositories are indexed.

Vulnerability in Sophos Web Appliance

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.

EPSS: 0.943 (99.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Sophos Web Appliance — versions unspecified

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-11-16. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-12-07.

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

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-1671?: CVE-2023-1671 is a critical-severity vulnerability in Sophos Web Appliance. CVSS score: 9.8/10. Published 2023-04-04.
How severe is CVE-2023-1671?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-1671 known to be exploited?: Yes. CVE-2023-1671 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-16), indicating it is being actively exploited. 15 public proof-of-concept repositories are indexed.