Microsoft Silverlight Runtime Remote Code Execution Vulnerability
Microsoft Silverlight mishandles negative offsets during decoding, which allows attackers to execute remote code or cause a denial-of-service (DoS).
- Vendor
- Microsoft
- Product
- Silverlight
- CVSS
- 8.8
- EPSS (exploit probability)
- 69.4%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2016-0034 being exploited?
Yes. CISA added CVE-2016-0034 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 69.4% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2016-0034 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionThe impacted products are end-of-life and should be disconnected if still in use.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Microsoft Silverlight CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2013-3896 Microsoft Silverlight Information Disclosure Vulnerability | [ MEDIUM ] | 5.5 | 67.1% | |
| CVE-2013-0074 Microsoft Silverlight Double Dereference Vulnerabilityransomware use | [ HIGH ] | 7.8 | 78.9% |