CVE-2018-8581

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 27%CVSS: 7.4Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · public exploitExposed: 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)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
27%
EPSS %ILE
98%
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 98× in last 7d / 362× 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 1,073 total refreshes for this CVE.

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

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 critical 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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