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Exploited vulnerability · CISA KEV

Is CVE-2019-15949 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Nagios XI · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-15949, Nagios XI Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 790 days after it was published. It affects Nagios XI. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity8.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Nagios XI contains a remote code execution vulnerability in which a user can modify the check_plugin executable and insert malicious commands to execute as root.

VendorNagios (4 exploited CVEs in KEV)
ProductNagios XI
VulnerabilityNagios XI Remote Code Execution Vulnerability
WeaknessCWE-78
Published5 Sep 2019
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Nagios XI in your asset inventory, including appliances and cloud images. Stack check lists every exploited Nagios 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 5 Sep 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Nagios.

Other exploited CVEs in Nagios XI

References

Questions

Is CVE-2019-15949 being exploited?

Yes. CISA added CVE-2019-15949 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-15949 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-2019-15949?

Apply updates per vendor instructions. Check Nagios's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Nagios XI 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 2021 · Nagios scorecard · act-now radar.

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