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Exploited vulnerability · CISA KEV

Is CVE-2018-4939 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Adobe ColdFusion · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2018-4939, Adobe ColdFusion Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 1264 days after it was published. It affects Adobe ColdFusion. 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
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

Adobe ColdFusion contains a deserialization of untrusted data vulnerability that could allow for code execution.

VendorAdobe (83 exploited CVEs in KEV)
ProductColdFusion
VulnerabilityAdobe ColdFusion Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published19 May 2018
Added to KEV3 Nov 2021
Reported by (CNA)adobe

What to do

  1. Check whether you run it. Look for ColdFusion in your asset inventory, including appliances and cloud images. Stack check lists every exploited Adobe 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 19 May 2018.
  4. Get told next time. Email alerts when CISA adds a CVE for Adobe.

Other exploited CVEs in ColdFusion

References

Questions

Is CVE-2018-4939 being exploited?

Yes. CISA added CVE-2018-4939 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2018-4939 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-2018-4939?

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

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