How severe is CVE-2017-0149?

CVE-2017-0149 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-0149 being actively exploited?

Yes. CVE-2017-0149 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-05-24, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2017-0149?

CVE-2017-0149 primarily affects Microsoft Internet Explorer. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-0149?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2017-0149 have an EU (EUVD) identifier?

Yes. CVE-2017-0149 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-0516. It is also flagged as exploited in the EUVD (since 2022-05-24).

When was CVE-2017-0149 published?

CVE-2017-0149 was published on 2017-03-17 and last updated on 2026-06-17.

CVE-2017-0149

CVE-2017-0149 is a high-severity vulnerability in Microsoft Internet Explorer with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-05-24). The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 7.6
EPSS exploit prediction: 29% (98th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-05-24)
EU (EUVD) id: EUVD-2017-0516
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-05-24)
Weakness: CWE-787
Affected product: Microsoft Internet Explorer
Published: 2017-03-17
Last modified: 2026-06-17

Description

Microsoft Internet Explorer 9 through 11 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability." This vulnerability is different from those described in CVE-2017-0018 and CVE-2017-0037.

Frequently asked questions

What is CVE-2017-0149?: Microsoft Internet Explorer 9 through 11 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability." This vulnerability is different from those described in CVE-2017-0018 and CVE-2017-0037.
How severe is CVE-2017-0149?: CVE-2017-0149 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-0149 being actively exploited?: Yes. CVE-2017-0149 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-05-24, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2017-0149?: CVE-2017-0149 primarily affects Microsoft Internet Explorer. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-0149?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2017-0149 have an EU (EUVD) identifier?: Yes. CVE-2017-0149 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-0516. It is also flagged as exploited in the EUVD (since 2022-05-24).
When was CVE-2017-0149 published?: CVE-2017-0149 was published on 2017-03-17 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:10:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*

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