CVE-2018-8581

HIGHNVD 7.49.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.4 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
7.4
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 28%CVSS: 7.4Exploit: NoneExposed: 0

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

An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka "Microsoft Exchange Server Elevation of Privilege Vulnerability." This affects Microsoft Exchange Server.

CVSS v3
7.4
EG Score
9.0(high)
EPSS
97.8%
KEV
⚠ Exploited

Published

November 14, 2018

Last Modified

October 28, 2025

Advisory Details (4)

Auto-updated Jun 6, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, microsoft.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8581
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8581
generic
http://www.securitytracker.com/id/1042141
generic
http://www.securityfocus.com/bid/105837

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 137× in last 7d / 578× 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 724 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCRidter/Exchange2domain
    First seen Jan 24, 2019

    CVE-2018-8581

    Open source ↗
  • GitHub PoCqiantu88/CVE-2018-8581
    First seen Dec 28, 2018

    CVE-2018-8581

    Open source ↗
  • GitHub PoCWyAtu/CVE-2018-8581
    First seen Dec 27, 2018

    CVE-2018-8581 | Microsoft Exchange Server Elevation of Privilege Vulnerability

    Open source ↗

Frequently asked(6)

What is CVE-2018-8581?
CVE-2018-8581 is a high vulnerability published on November 14, 2018. An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka "Microsoft Exchange Server Elevation of Privilege Vulnerability." This affects Microsoft Exchange Server.
When was CVE-2018-8581 disclosed?
CVE-2018-8581 was first published in the National Vulnerability Database on November 14, 2018, with the most recent update on October 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-8581 actively exploited?
Yes. CISA added CVE-2018-8581 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Microsoft Exchange Server. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-8581?
CVE-2018-8581 has a CVSS v3 base score of 7.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-8581?
CVE-2018-8581 affects Microsoft Exchange Server. 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-2018-8581?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8581, 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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