How severe is CVE-2023-1671?

CVE-2023-1671 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-1671 being actively exploited?

Yes. CVE-2023-1671 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-11-16, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-1671?

CVE-2023-1671 affects Sophos Web Appliance. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-1671?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-1671 have an EU (EUVD) identifier?

Yes. CVE-2023-1671 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-23899. It is also flagged as exploited in the EUVD (since 2023-11-16).

When was CVE-2023-1671 published?

CVE-2023-1671 was published on 2023-04-04 and last updated on 2026-06-17.

CVE-2023-1671

CVE-2023-1671 is a critical-severity vulnerability in Sophos Web Appliance with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-11-16). The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 100% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2023-11-16)
EU (EUVD) id: EUVD-2023-23899
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-11-16)
Weakness: CWE-77
Affected product: Sophos Web Appliance
Published: 2023-04-04
Last modified: 2026-06-17

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.

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.
How severe is CVE-2023-1671?: CVE-2023-1671 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-1671 being actively exploited?: Yes. CVE-2023-1671 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-11-16, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2023-1671?: CVE-2023-1671 affects Sophos Web Appliance. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-1671?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2023-1671 have an EU (EUVD) identifier?: Yes. CVE-2023-1671 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-23899. It is also flagged as exploited in the EUVD (since 2023-11-16).
When was CVE-2023-1671 published?: CVE-2023-1671 was published on 2023-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sophos:web_appliance:*:*:*:*:*:*:*:*

More vulnerabilities in Sophos Web Appliance

CVE-2017-6182 — Critical (CVSS 9.8): In Sophos Web Appliance (SWA) before 4.3.1.2, a section of the machine's interface responsible for generating reports…
CVE-2013-2642 — Critical (CVSS 9.3): Sophos Web Appliance before 3.7.8.2 allows (1) remote attackers to execute arbitrary commands via shell metacharacters…
CVE-2014-2850 — High (CVSS 8.5): The network interface configuration page (netinterface) in Sophos Web Appliance before 3.8.2 allows remote…
CVE-2014-2849 — High (CVSS 8.5): The Change Password dialog box (change_password) in Sophos Web Appliance before 3.8.2 allows remote authenticated users…
CVE-2017-6412 — High (CVSS 8.1): In Sophos Web Appliance (SWA) before 4.3.1.2, Session Fixation could occur, aka NSWA-1310.
CVE-2022-4934 — High (CVSS 7.2): A post-auth command injection vulnerability in the exception wizard of Sophos Web Appliance older than version 4.3.10.4…

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