How severe is CVE-2015-1635?

CVE-2015-1635 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-1635 being actively exploited?

Yes. CVE-2015-1635 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-10, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2015-1635?

CVE-2015-1635 primarily affects Microsoft Windows 7. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-1635?

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-2015-1635 have an EU (EUVD) identifier?

Yes. CVE-2015-1635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2015-1765. It is also flagged as exploited in the EUVD (since 2022-02-10).

When was CVE-2015-1635 published?

CVE-2015-1635 was published on 2015-04-14 and last updated on 2026-06-17.

CVE-2015-1635

CVE-2015-1635 is a critical-severity vulnerability in Microsoft Windows 7 with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-02-10). The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 100% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-02-10)
EU (EUVD) id: EUVD-2015-1765
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-02-10)
Weakness: CWE-94
Affected product: Microsoft Windows 7
Published: 2015-04-14
Last modified: 2026-06-17

Description

HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1, and Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted HTTP requests, aka "HTTP.sys Remote Code Execution Vulnerability."

Frequently asked questions

What is CVE-2015-1635?: HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1, and Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted HTTP requests, aka "HTTP.sys Remote Code Execution Vulnerability."
How severe is CVE-2015-1635?: CVE-2015-1635 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-1635 being actively exploited?: Yes. CVE-2015-1635 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-10, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2015-1635?: CVE-2015-1635 primarily affects Microsoft Windows 7. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-1635?: 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-2015-1635 have an EU (EUVD) identifier?: Yes. CVE-2015-1635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2015-1765. It is also flagged as exploited in the EUVD (since 2022-02-10).
When was CVE-2015-1635 published?: CVE-2015-1635 was published on 2015-04-14 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_8:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

82.199.197.245 (ipv4-addr)
59.34.17.130 (ipv4-addr)
123.30.97.105 (ipv4-addr)