CVE-2023-34048

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 2024-01-22), 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
Exploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 99%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

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

vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol. A malicious actor with network access to vCenter Server may trigger an out-of-bounds write potentially leading to remote code execution.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
84(Attend)
EG Risk 84/100SSVC: 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
Severity98% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
99%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

October 25, 2023

Last Modified

October 30, 2025

Advisory Details (3)

Auto-updated Aug 5, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
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-2023-34048
generic🔴 Active Exploitation

Support Content Notification - Support Portal - Broadcom support portal

https://www.vmware.com/security/advisories/VMSA-2023-0023.html
generic🟡 PoC Available

Understanding CVE-2023-34048, A zero-day out-of-bound write in vCenter server - vsociety

https://www.vicarius.io/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-server

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 168× 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 444 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Nucleihttp/cves/2023/CVE-2023-34048.yaml
    First seen Jan 1, 2023

    VMware vCenter Server - Out-of-Bounds Write

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2023-34048?
CVE-2023-34048 is a critical vulnerability published on October 25, 2023. vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol. A malicious actor with network access to vCenter Server may trigger an out-of-bounds write potentially leading to remote code execution.
When was CVE-2023-34048 disclosed?
CVE-2023-34048 was first published in the National Vulnerability Database on October 25, 2023, with the most recent update on October 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-34048 actively exploited?
Yes. CISA added CVE-2023-34048 to the Known Exploited Vulnerabilities catalog on January 22, 2024, affecting VMware vCenter Server. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-34048?
CVE-2023-34048 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2023-34048?
CVE-2023-34048 affects VMware vCenter 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-2023-34048?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-34048, 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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