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Exploited vulnerability · CISA KEV

Is CVE-2017-9805 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Apache Struts · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-9805, Apache Struts Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 1510 days after it was published. It affects Apache Struts. 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
severity8.1CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Apache Struts REST Plugin uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to remote code execution when deserializing XML payloads.

VendorApache (41 exploited CVEs in KEV)
ProductStruts
VulnerabilityApache Struts Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published15 Sep 2017
Added to KEV3 Nov 2021
Reported by (CNA)apache

What to do

  1. Check whether you run it. Look for Struts in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache 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 15 Sep 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in Struts

References

Questions

Is CVE-2017-9805 being exploited?

Yes. CISA added CVE-2017-9805 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-9805 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-2017-9805?

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

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