CVE-2023-32031

CRITICALNVD 8.89.0
EchelonGraph scoreHIGH confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score elevated to 9.0 because EPSS predicted 81% probability of exploitation within the next 30 days (99th percentile of EPSS-scored CVEs) when EchelonGraph scored this CVE. NVD baseline CVSS 8.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction (continuous uplift above 30%)
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated

Also known asEUVD-2023-36318 (ENISA EUVD) · GHSA-5p9r-7qr9-fhwh (GitHub Security Advisories)Source: ENISA EUVD

9.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 81%
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 81%CVSS: 8.8Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS v3
8.8
EG Score
9.0CRITICALhigh confidence
EG Risk
72
EG Risk 72/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation81% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
81%
EPSS %ILE
99th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.0): severity, escalated by confirmed exploitation. This CVE's 9.0 is EPSS's lift toward 9.0 from its impact severity (EG Severity, CVSS 8.8 HIGH): a likelihood of exploitation, not impact.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
81% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 14, 2023

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Aug 13, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-32031

Vendor Advisories for CVE-2023-32031(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 52× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 173 rows on record for this CVE, as 99 entries (1 repeat merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 73 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 12:30 UTCEchelonGraph re-scored
  2. 2026-11-13 12:30 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  3. 2026-11-12 12:11 UTCEchelonGraph re-scored
  4. 2026-11-12 12:11 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  5. 2026-11-11 16:33 UTCEPSS rescoreEPSS 81% · 99th percentile
  6. 2026-11-11 11:51 UTCEchelonGraph re-scored
  7. 2026-11-11 11:51 UTCVendor advisory
  8. 2026-11-11 11:51 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-11-10 16:37 UTCEPSS rescoreEPSS 81% · 99th percentile
  10. 2026-11-10 11:31 UTCEchelonGraph re-scored
  11. 2026-11-10 11:31 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  12. 2026-11-09 11:11 UTCEchelonGraph re-scored
  13. 2026-11-09 11:11 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  14. 2026-11-08 10:52 UTCEchelonGraph re-scored
  15. 2026-11-08 10:52 UTCVendor advisory
  16. 2026-11-08 10:52 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  17. 2026-11-07 10:33 UTCEchelonGraph re-scored
  18. 2026-11-07 10:33 UTCVendor advisory
  19. 2026-11-07 10:33 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  20. 2026-11-06 16:31 UTCEPSS rescoreEPSS 81% · 99th percentile
  21. 2026-11-06 10:14 UTCEchelonGraph re-scored
  22. 2026-11-06 10:14 UTCVendor advisory
  23. 2026-11-06 10:14 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-11-05 09:51 UTCEchelonGraph re-scored
  25. 2026-11-05 09:51 UTCVendor advisory
Show 74 more
  1. 2026-11-05 09:51 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  2. 2026-11-04 16:31 UTCEPSS rescoreEPSS 81% · 99th percentile
  3. 2026-11-04 09:32 UTCEchelonGraph re-scored
  4. 2026-11-04 09:32 UTCVendor advisory
  5. 2026-11-04 09:32 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  6. 2026-11-03 16:40 UTCEPSS rescoreEPSS 81% · 99th percentile
  7. 2026-11-03 09:12 UTCEchelonGraph re-scored
  8. 2026-11-03 09:12 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-11-02 08:54 UTCEchelonGraph re-scored
  10. 2026-11-02 08:54 UTCVendor advisory
  11. 2026-11-02 08:54 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  12. 2026-11-01 08:34 UTCEchelonGraph re-scored
  13. 2026-11-01 08:34 UTCVendor advisory
  14. 2026-11-01 08:34 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-10-31 08:15 UTCEchelonGraph re-scored
  16. 2026-10-31 08:15 UTCVendor advisory
  17. 2026-10-31 08:15 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-10-30 16:31 UTCEPSS rescoreEPSS 81% · 99th percentile
  19. 2026-10-30 07:56 UTCEchelonGraph re-scored
  20. 2026-10-30 07:56 UTCVendor advisory
  21. 2026-10-30 07:56 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-10-29 07:37 UTCEchelonGraph re-scored
  23. 2026-10-29 07:37 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-10-28 16:29 UTCEPSS rescoreEPSS 81% · 99th percentile
  25. 2026-10-28 07:19 UTCEchelonGraph re-scored
  26. 2026-10-28 07:19 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  27. 2026-10-27 07:01 UTCEchelonGraph re-scored
  28. 2026-10-27 07:00 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  29. 2026-10-26 16:28 UTCEPSS rescoreEPSS 81% · 99th percentile
  30. 2026-10-26 03:34 UTCVendor advisory
  31. 2026-10-26 03:34 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-10-25 17:42 UTCEchelonGraph re-scored
  33. 2026-10-25 16:29 UTCEPSS rescoreEPSS 81% · 99th percentile
  34. 2026-10-25 03:12 UTCEchelonGraph re-scored
  35. 2026-10-25 03:12 UTCVendor advisory
  36. 2026-10-25 03:12 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  37. 2026-10-24 02:53 UTCEchelonGraph re-scored
  38. 2026-10-24 02:53 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  39. 2026-10-23 02:34 UTCEchelonGraph re-scored
  40. 2026-10-23 02:34 UTCVendor advisory
  41. 2026-10-23 02:34 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  42. 2026-10-22 16:31 UTCEPSS rescoreEPSS 81% · 99th percentile
  43. 2026-10-22 02:15 UTCEchelonGraph re-scored
  44. 2026-10-22 02:15 UTCVendor advisory
  45. 2026-10-22 02:15 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  46. 2026-10-21 16:29 UTCEPSS rescoreEPSS 81% · 99th percentile
  47. 2026-10-21 01:56 UTCEchelonGraph re-scored
  48. 2026-10-21 01:55 UTCGHSA enrichmentGHSA-5p9r-7qr9-fhwh · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-10-20 16:29 UTCEPSS rescoreEPSS 81% · 99th percentile
  50. 2026-10-18 08:01 UTCEchelonGraph re-scored
  51. 2026-10-16 16:35 UTCEPSS rescoreEPSS 81% · 99th percentile
  52. 2026-10-14 16:29 UTCEPSS rescoreEPSS 81% · 99th percentile
  53. 2026-10-13 16:30 UTCEPSS rescoreEPSS 81% · 99th percentile
  54. 2026-10-12 18:27 UTCEchelonGraph re-scored
  55. 2026-10-11 21:53 UTCEchelonGraph re-scored
  56. 2026-10-09 20:05 UTCEPSS rescoreEPSS 81% · 99th percentile
  57. 2026-10-07 23:46 UTCEPSS rescoreEPSS 81% · 99th percentile
  58. 2026-10-03 14:23 UTCEPSS rescoreEPSS 81% · 99th percentile
  59. 2026-09-30 16:23 UTCEchelonGraph re-scored
  60. 2026-09-29 15:16 UTCEPSS rescoreEPSS 81% · 99th percentile
  61. 2026-09-27 13:42 UTCEPSS rescoreEPSS 81% · 99th percentile
  62. 2026-09-26 15:55 UTCEPSS rescoreEPSS 81% · 99th percentile
  63. 2026-09-24 14:01 UTCEPSS rescoreEPSS 81% · 99th percentile
  64. 2026-09-23 13:45 UTCEPSS rescoreEPSS 81% · 99th percentile
  65. 2026-09-22 14:45 UTCEPSS rescoreEPSS 81% · 99th percentile
  66. 2026-09-16 14:05 UTCEPSS rescoreEPSS 81% · 99th percentile
  67. 2026-09-12 14:58 UTCEPSS rescoreEPSS 81% · 99th percentile
  68. 2026-09-06 13:45 UTCEPSS rescoreEPSS 81% · 99th percentile
  69. 2026-09-05 15:26 UTCEPSS rescoreEPSS 81% · 99th percentile
  70. 2026-09-01 13:51 UTCEPSS rescoreEPSS 81% · 99th percentile
  71. 2026-08-30 19:15 UTCEPSS rescoreEPSS 81% · 99th percentile
  72. 2026-08-30 01:20 UTCEPSS rescoreEPSS 81% · 99th percentile
  73. 2026-08-28 21:38 UTCEPSS rescoreEPSS 81% · 99th percentile
  74. 2026-08-26 14:43 UTCEPSS rescoreEPSS 81% · 99th percentile

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCAvento/CVE-2023-32031
    Published Nov 10, 2023

    CVE-2023-32031 MS Exchange PowerShell backend RCE

    Open source ↗

Frequently asked(5)

What is CVE-2023-32031?
CVE-2023-32031 is a critical-severity vulnerability; its CVE record was published on June 14, 2023. Microsoft Exchange Server Remote Code Execution Vulnerability
When was CVE-2023-32031 made public?
CVE-2023-32031 was made public on June 13, 2023: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on June 14, 2023. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2023-32031 actively exploited?
CVE-2023-32031 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-32031?
CVE-2023-32031 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
How do I remediate CVE-2023-32031?
A fix for CVE-2023-32031 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-32031 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2023-32031

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