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Exploited vulnerability · CISA KEV

Is CVE-2021-39144 exploited? Yes: in CISA KEV since 10 Mar 2023

Gociux · XStream · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-39144, XStream Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Mar 2023, 564 days after it was published. It affects XStream. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 10 Mar 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity8.5CVSS 3.1 · high
US federal due31 Mar 2023BOD 22-01 deadline

What it is

XStream contains a remote code execution vulnerability that allows an attacker to manipulate the processed input stream and replace or inject objects that result in the execution of a local command on the server. This vulnerability can affect multiple products, including but not limited to VMware Cloud Foundation.

VendorXStream (1 exploited CVE in KEV)
ProductXStream
VulnerabilityXStream Remote Code Execution Vulnerability
WeaknessCWE-94, CWE-502
Published23 Aug 2021
Added to KEV10 Mar 2023
Reported by (CNA)GitHub_M

What to do

  1. Check whether you run it. Look for XStream in your asset inventory, including appliances and cloud images. Stack check lists every exploited XStream 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 23 Aug 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for XStream.

References

Questions

Is CVE-2021-39144 being exploited?

Yes. CISA added CVE-2021-39144 to the Known Exploited Vulnerabilities catalog on 10 Mar 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-39144 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-2021-39144?

Apply updates per vendor instructions. Check XStream's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected XStream 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 2023 · act-now radar.

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