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Exploited vulnerability · CISA KEV

Is CVE-2023-2868 exploited? Yes: in CISA KEV since 26 May 2023

Gociux · Barracuda Networks Email Security Gateway (ESG) Appliance · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-2868, Barracuda Networks ESG Appliance Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 26 May 2023, 2 days after it was published. It affects Barracuda Networks Email Security Gateway (ESG) Appliance, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 26 May 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.4CVSS 3.1 · critical
US federal due16 Jun 2023BOD 22-01 deadline

What it is

Barracuda Email Security Gateway (ESG) appliance contains an improper input validation vulnerability of a user-supplied .tar file, leading to remote command injection.

VendorBarracuda Networks (3 exploited CVEs in KEV)
ProductEmail Security Gateway (ESG) Appliance
VulnerabilityBarracuda Networks ESG Appliance Improper Input Validation Vulnerability
WeaknessCWE-20
Published24 May 2023
Added to KEV26 May 2023
Reported by (CNA)Google

What to do

  1. Check whether you run it. Look for Email Security Gateway (ESG) Appliance in your asset inventory, including appliances and cloud images. Stack check lists every exploited Barracuda Networks CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  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 24 May 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Barracuda Networks.

References

Questions

Is CVE-2023-2868 being exploited?

Yes. CISA added CVE-2023-2868 to the Known Exploited Vulnerabilities catalog on 26 May 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-2868 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-2023-2868?

Apply updates per vendor instructions. Check Barracuda Networks's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Email Security Gateway (ESG) 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 May 2023 · Barracuda Networks scorecard · act-now radar.

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