Exploited· due 2022-06-158.8highHighused in ransomware
CVE-2016-0034
Microsoft Silverlight
Microsoft Silverlight 5 before 5.1.41212.0 mishandles negative offsets during decoding, which allows remote attackers to execute arbitrary code or cause a denial of service (object-header corruption) via a crafted web site, aka "Silverlight Runtime Remote Code Execution Vulnerability."
Exploitation status
- CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
- It is known to have been used in ransomware campaigns.
- US federal civilian agencies are required to remediate it by 2022-06-15. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
- A vendor advisory or patch reference has been published.
Required action
The impacted products are end-of-life and should be disconnected if still in use.
CISA’s wording, unedited.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, no account is needed.
- Beyond that, someone has to be persuaded to take an action first.
Scoring
- CVSS
- 8.8 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Assigned by
- secure@microsoft.com
Dates
- Published
- 2016-01-13
- Last modified
- 2026-08-14
- Added to KEV
- 2022-05-25
- Remediation due
- 2022-06-15
- Sources
- CISA KEV, NVD
Affected products
- Microsoft Silverlight5.0 - 5.1.41212.0
As listed in the NVD configuration data. Not a statement about your estate.