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Exploited vulnerability · CISA KEV

Is CVE-2016-3976 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · SAP NetWeaver · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-3976, SAP NetWeaver Directory Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 2036 days after it was published. It affects SAP NetWeaver. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.5CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

SAP NetWeaver Application Server Java Platforms contains a directory traversal vulnerability via a ..\ (dot dot backslash) in the fileName parameter to CrashFileDownloadServlet. This allows remote attackers to read files.

VendorSAP (14 exploited CVEs in KEV)
ProductNetWeaver
VulnerabilitySAP NetWeaver Directory Traversal Vulnerability
WeaknessCWE-22
Published7 Apr 2016
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for NetWeaver in your asset inventory, including appliances and cloud images. Stack check lists every exploited SAP 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 7 Apr 2016.
  4. Get told next time. Email alerts when CISA adds a CVE for SAP.

Other exploited CVEs in NetWeaver

References

Questions

Is CVE-2016-3976 being exploited?

Yes. CISA added CVE-2016-3976 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2016-3976 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-2016-3976?

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

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