CVE-2016-3351

Microsoft Internet Explorer 9 through 11 and Microsoft Edge allow remote attackers to obtain sensitive information via a crafted web site, aka "Microsoft Browser Information Disclosure Vulnerability."

CVSS: 6.5Mediumscored by CISA
Exploited in the wild: Yes, in CISA KEV since 24 May 2022CISA deadline for US federal agencies: 14 Jun 2022known use in ransomware campaigns
EPSS: 26.5%chance of exploitation in the next 30 daystop 2% of scored CVEsFIRST score of 11 Nov 2026
Fix: Patch availablesee the advisories in the references
Published: 14 Sept 2016analysed here 12 Nov 2026

Do first. Apply updates per vendor instructions. (CISA's required action for this KEV entry)

Summary

Triage

Exploitable: At runtime
Attack vector: network
Can a WAF block it?: Partly. See why

The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.

Affected products

Products named in our analysis

microsoft:internet_explorer
microsoft:edge

Fix and mitigation

WAF and other mitigations

Can a WAF block it? Partly. The bug can be reached over the network, so generic WAF rules may stop some attacks. Its weakness type is unknown, so we cannot be more precise.

Also consider: patch

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

Remediation steps (AI-written)

Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.

Exploitation evidence

CISA KEV catalog: Listed since 24 May 2022. Known use in ransomware campaigns.
CISA due date: 14 Jun 2022, the remediation deadline for US federal agencies
CISA required action: Apply updates per vendor instructions.
Public exploit code: None on record in Exploit-DB, Metasploit, Nuclei templates or PoC-in-GitHub.
CISA SSVC: exploitation active, automatable no, technical impact partialAssessed by CISA 23 Jun 2022 (SSVC 2.0.3). Exploitation is none, poc (public proof of concept) or active.

Timeline

14 Sept 2016Published
24 May 2022Added to CISA KEV (exploited in the wild)2,078 days (about 6 years) later
14 Jun 2022CISA remediation due date (US federal agencies)21 days later
23 Jun 2022CISA SSVC assessment: exploitation active9 days later
14 Aug 2026CVE record last updated1,513 days (about 4 years) later
12 Nov 2026Analysed by vulneraibility.com90 days (about 3 months) later

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Metric	Value	What it means
Attack vector	NetworkReachable over the internet or any routable network.	Reachable over the internet or any routable network.
Attack complexity	LowRepeatable attack, no special conditions.	Repeatable attack, no special conditions.
Privileges required	NoneThe attacker needs no prior access.	The attacker needs no prior access.
User interaction	RequiredA victim must click, open or otherwise cooperate.	A victim must click, open or otherwise cooperate.
Scope	UnchangedImpact stays within the vulnerable component.	Impact stays within the vulnerable component.
Confidentiality	HighTotal data disclosure possible.	Total data disclosure possible.
Integrity	NoneNo unauthorised modification.	No unauthorised modification.
Availability	NoneThe service stays up.	The service stays up.

Common questions

Is CVE-2016-3351 being exploited?

Yes. CVE-2016-3351 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2016-3351?

CVE-2016-3351 is rated Medium with a CVSS score of 6.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2016-3351?

Yes. A fix has been recorded for CVE-2016-3351. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2016-3351 affect?

CVE-2016-3351 affects microsoft:internet_explorer, microsoft:edge. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

References

NVD CVE.org CVE Details Source

7 references in the CVE record, grouped by the tags the record gives them.

Advisories (2)

docs.microsoft.com /en-us/security-updates/securitybulletins/2016/ms16-104
docs.microsoft.com /en-us/security-updates/securitybulletins/2016/ms16-105

Where the data on this page comes from

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA KEV catalog: exploitation, date added, due date
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile

Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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