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Exploited vulnerability · CISA KEV

Is CVE-2023-1671 exploited? Yes: in CISA KEV since 16 Nov 2023

Gociux · Sophos Web Appliance · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-1671, Sophos Web Appliance Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 16 Nov 2023, 226 days after it was published. It affects Sophos Web Appliance. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 16 Nov 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due7 Dec 2023BOD 22-01 deadline

What it is

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

VendorSophos (7 exploited CVEs in KEV)
ProductWeb Appliance
VulnerabilitySophos Web Appliance Command Injection Vulnerability
WeaknessCWE-77
Published4 Apr 2023
Added to KEV16 Nov 2023
Reported by (CNA)Sophos

What to do

  1. Check whether you run it. Look for Web Appliance in your asset inventory, including appliances and cloud images. Stack check lists every exploited Sophos CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 4 Apr 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Sophos.

References

Questions

Is CVE-2023-1671 being exploited?

Yes. CISA added CVE-2023-1671 to the Known Exploited Vulnerabilities catalog on 16 Nov 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-1671 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2023-1671?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Sophos's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Web Appliance and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2023 · Sophos scorecard · act-now radar.

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