CVE-2015-1635

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-02-10), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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."

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
100.0%
KEV
⚠ Exploited

Published

April 14, 2015

Last Modified

April 22, 2026

Advisory Details (5)

Auto-updated May 12, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic
http://www.securityfocus.com/bid/74013
generic🟡 PoC Available

Microsoft Windows - 'HTTP.sys' HTTP Request Parsing Denial of Service (MS15-034) - Windows dos Exploit

https://www.exploit-db.com/exploits/36776/
generic🟡 PoC Available

Microsoft Windows - 'HTTP.sys' (PoC) (MS15-034) - Windows dos Exploit

https://www.exploit-db.com/exploits/36773/
generic

Microsoft Security Bulletin MS15-034 - Critical | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-034
generic
http://www.securitytracker.com/id/1032109

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 33× in last 7d / 189× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 382 total refreshes for this CVE.

  1. 2026-07-23 01:16 UTCEG score recompute
  2. 2026-07-23 00:19 UTCEG score recompute
  3. 2026-07-22 21:57 UTCEG score recompute
  4. 2026-07-22 20:49 UTCGHSA enrichment
  5. 2026-07-22 19:40 UTCCISA KEV update
  6. 2026-07-22 16:58 UTCGHSA enrichment
  7. 2026-07-22 13:07 UTCGHSA enrichment
  8. 2026-07-22 09:16 UTCGHSA enrichment
  9. 2026-07-22 05:24 UTCGHSA enrichment
  10. 2026-07-22 01:27 UTCGHSA enrichment
  11. 2026-07-21 21:36 UTCGHSA enrichment
  12. 2026-07-21 17:46 UTCGHSA enrichment
  13. 2026-07-21 14:37 UTCCISA KEV update
  14. 2026-07-21 13:56 UTCGHSA enrichment
  15. 2026-07-21 10:05 UTCGHSA enrichment
  16. 2026-07-21 06:14 UTCGHSA enrichment
  17. 2026-07-21 02:24 UTCGHSA enrichment
  18. 2026-07-20 22:33 UTCGHSA enrichment
  19. 2026-07-20 18:43 UTCGHSA enrichment
  20. 2026-07-20 14:54 UTCGHSA enrichment
  21. 2026-07-20 10:42 UTCGHSA enrichment
  22. 2026-07-20 06:53 UTCGHSA enrichment
  23. 2026-07-20 03:01 UTCGHSA enrichment
  24. 2026-07-19 23:11 UTCGHSA enrichment
  25. 2026-07-19 19:21 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 15:29 UTCGHSA enrichment
  2. 2026-07-19 11:39 UTCGHSA enrichment
  3. 2026-07-19 07:49 UTCGHSA enrichment
  4. 2026-07-19 03:59 UTCGHSA enrichment
  5. 2026-07-19 00:08 UTCGHSA enrichment
  6. 2026-07-18 20:18 UTCGHSA enrichment
  7. 2026-07-18 16:28 UTCGHSA enrichment
  8. 2026-07-18 12:36 UTCGHSA enrichment
  9. 2026-07-18 08:46 UTCGHSA enrichment
  10. 2026-07-18 04:56 UTCGHSA enrichment
  11. 2026-07-18 01:05 UTCGHSA enrichment
  12. 2026-07-17 21:16 UTCGHSA enrichment
  13. 2026-07-17 17:26 UTCGHSA enrichment
  14. 2026-07-17 13:36 UTCGHSA enrichment
  15. 2026-07-17 09:46 UTCEG score recompute
  16. 2026-07-17 09:46 UTCGHSA enrichment
  17. 2026-07-17 05:57 UTCGHSA enrichment
  18. 2026-07-17 02:05 UTCGHSA enrichment
  19. 2026-07-16 22:15 UTCGHSA enrichment
  20. 2026-07-16 18:25 UTCGHSA enrichment
  21. 2026-07-16 17:04 UTCCISA KEV update
  22. 2026-07-16 14:33 UTCGHSA enrichment
  23. 2026-07-16 10:43 UTCGHSA enrichment
  24. 2026-07-16 06:50 UTCGHSA enrichment
  25. 2026-07-16 03:00 UTCGHSA enrichment
  26. 2026-07-15 23:10 UTCGHSA enrichment
  27. 2026-07-15 19:20 UTCGHSA enrichment
  28. 2026-07-15 16:49 UTCCISA KEV update
  29. 2026-07-15 15:29 UTCGHSA enrichment
  30. 2026-07-15 15:04 UTCCISA KEV update
  31. 2026-07-15 11:39 UTCGHSA enrichment
  32. 2026-07-15 07:49 UTCGHSA enrichment
  33. 2026-07-15 03:59 UTCGHSA enrichment
  34. 2026-07-15 00:09 UTCGHSA enrichment
  35. 2026-07-14 20:17 UTCGHSA enrichment
  36. 2026-07-14 18:05 UTCCISA KEV update
  37. 2026-07-14 16:26 UTCGHSA enrichment
  38. 2026-07-14 12:36 UTCGHSA enrichment
  39. 2026-07-14 08:46 UTCGHSA enrichment
  40. 2026-07-14 04:56 UTCGHSA enrichment
  41. 2026-07-14 01:06 UTCGHSA enrichment
  42. 2026-07-13 21:16 UTCGHSA enrichment
  43. 2026-07-13 17:26 UTCGHSA enrichment
  44. 2026-07-13 17:07 UTCCISA KEV update
  45. 2026-07-13 13:36 UTCGHSA enrichment
  46. 2026-07-13 09:46 UTCGHSA enrichment
  47. 2026-07-13 05:56 UTCGHSA enrichment
  48. 2026-07-13 02:06 UTCGHSA enrichment
  49. 2026-07-12 22:16 UTCGHSA enrichment
  50. 2026-07-12 18:26 UTCGHSA enrichment
  51. 2026-07-12 14:35 UTCGHSA enrichment
  52. 2026-07-12 10:45 UTCGHSA enrichment
  53. 2026-07-12 06:55 UTCGHSA enrichment
  54. 2026-07-12 03:05 UTCGHSA enrichment
  55. 2026-07-11 23:14 UTCGHSA enrichment
  56. 2026-07-11 19:24 UTCGHSA enrichment
  57. 2026-07-11 15:34 UTCGHSA enrichment
  58. 2026-07-11 11:44 UTCGHSA enrichment
  59. 2026-07-11 07:54 UTCGHSA enrichment
  60. 2026-07-11 04:04 UTCGHSA enrichment
  61. 2026-07-11 00:12 UTCGHSA enrichment
  62. 2026-07-10 20:22 UTCGHSA enrichment
  63. 2026-07-10 17:52 UTCCISA KEV update
  64. 2026-07-10 16:32 UTCGHSA enrichment
  65. 2026-07-10 12:42 UTCGHSA enrichment
  66. 2026-07-10 08:53 UTCGHSA enrichment
  67. 2026-07-10 05:04 UTCGHSA enrichment
  68. 2026-07-10 01:13 UTCGHSA enrichment
  69. 2026-07-09 21:22 UTCGHSA enrichment
  70. 2026-07-09 17:33 UTCGHSA enrichment
  71. 2026-07-09 13:42 UTCGHSA enrichment
  72. 2026-07-09 09:53 UTCGHSA enrichment
  73. 2026-07-09 06:03 UTCGHSA enrichment
  74. 2026-07-09 02:12 UTCGHSA enrichment
  75. 2026-07-08 22:21 UTCGHSA enrichment

Publicly available exploits

(9 references)

Working exploit code is in the public domain (2 Metasploit modules) (4 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCh3x0v3rl0rd/CVE-2015-1635-POC
    First seen Jul 12, 2021
    Open source ↗
  • GitHub PoCaedoo/CVE-2015-1635-POC
    First seen Jun 20, 2018

    MS15-034 HTTP.sys 远程执行代码检测脚本（MS15-034 HTTP.sys remote execution code poc script）

    Open source ↗
  • GitHub PoCtechnion/erlvulnscan
    First seen May 4, 2015

    Concurrent network scanner for CVE-2015-1635

    Open source ↗
  • Exploit-DBEDB-36776
    First seen Apr 16, 2015

    Microsoft Windows - 'HTTP.sys' HTTP Request Parsing Denial of Service (MS15-034)

    Open source ↗
  • GitHub PoCZx7ffa4512-Python/Project-CVE-2015-1635
    First seen Apr 16, 2015

    CVE-2015-1635,MS15-034

    Open source ↗
  • Exploit-DBEDB-36773
    First seen Apr 15, 2015

    Microsoft Windows - 'HTTP.sys' (PoC) (MS15-034)

    Open source ↗
  • Metasploitauxiliary/dos/http/ms15_034_ulonglongadd✓ verified
    First seen Jan 1, 2015

    MS15-034 HTTP Protocol Stack Request Handling Denial-of-Service

    Open source ↗
  • Metasploitauxiliary/scanner/http/ms15_034_http_sys_memory_dump✓ verified
    First seen Jan 1, 2015

    MS15-034 HTTP Protocol Stack Request Handling HTTP.SYS Memory Information Disclosure

    Open source ↗
  • Nucleihttp/cves/2015/CVE-2015-1635.yaml
    First seen Jan 1, 2015

    Microsoft Windows 'HTTP.sys' - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2015-1635?
CVE-2015-1635 is a critical vulnerability published on April 14, 2015. 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."
When was CVE-2015-1635 disclosed?
CVE-2015-1635 was first published in the National Vulnerability Database on April 14, 2015, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-1635 actively exploited?
Yes. CISA added CVE-2015-1635 to the Known Exploited Vulnerabilities catalog on February 10, 2022, affecting Microsoft HTTP.sys. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2015-1635?
CVE-2015-1635 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2015-1635?
CVE-2015-1635 affects Microsoft HTTP.sys. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2015-1635?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-1635, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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