Exploited vulnerability · CISA KEV

Is CVE-2016-0034 exploited? Yes: in CISA KEV since 25 May 2022

Gociux · Microsoft Silverlight · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-0034, Microsoft Silverlight Runtime Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 May 2022, 2324 days after it was published. It is known to be used in ransomware campaigns. It affects Microsoft Silverlight. If you run it, CISA's required action is: The impacted products are end-of-life and should be disconnected if still in use.

What it is

Microsoft Silverlight mishandles negative offsets during decoding, which allows attackers to execute remote code or cause a denial-of-service (DoS).

What to do

1. Check whether you run it. Look for Silverlight in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
2. Apply the fix. The impacted products are end-of-life and should be disconnected if still in use.
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 13 Jan 2016.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Silverlight

• CVE-2013-3896: Microsoft Silverlight Information Disclosure Vulnerability (25 May 2022)
• CVE-2013-0074: Microsoft Silverlight Double Dereference Vulnerability (25 May 2022)

References

• nvd.nist.gov/vuln/detail/CVE-2016-0034

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 May 2022 · Microsoft scorecard · act-now radar.