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Exploited vulnerability · CISA KEV

Is CVE-2020-7247 exploited? Yes: in CISA KEV since 25 Mar 2022

Gociux · OpenBSD OpenSMTPD · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-7247, OpenSMTPD Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Mar 2022, 786 days after it was published. It affects OpenBSD OpenSMTPD. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 25 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due15 Apr 2022BOD 22-01 deadline

What it is

smtp_mailaddr in smtp_session.c in OpenSMTPD, as used in OpenBSD and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session.

VendorOpenBSD (2 exploited CVEs in KEV)
ProductOpenSMTPD
VulnerabilityOpenSMTPD Remote Code Execution Vulnerability
WeaknessCWE-755, CWE-78
Published29 Jan 2020
Added to KEV25 Mar 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for OpenSMTPD in your asset inventory, including appliances and cloud images. Stack check lists every exploited OpenBSD 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 29 Jan 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for OpenBSD.

References

Questions

Is CVE-2020-7247 being exploited?

Yes. CISA added CVE-2020-7247 to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-7247 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-2020-7247?

Apply updates per vendor instructions. Check OpenBSD's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected OpenSMTPD 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 March 2022 · OpenBSD scorecard · act-now radar.

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