Page generated: 08 Nov 2026, 07:26 UTC
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CVE-2023-34048

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 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
9.0/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.8: +1.47
  • Fresh EPSS: 99.23%: +0.50

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 13 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Rescana
Press · 11 Feb 2026, 08:00 · UNC3886 Cyber Espionage Campaign Exploits Fortinet and VMware Zero-Days to Breach Singapore Telecom Sector - Rescana
Dark Reading
Press · 28 Jul 2025, 07:00 · 'Fire Ant' Cyber Spies Compromise Siloed VMware Systems - Dark Reading
The Hacker News
Press · 24 Jul 2025, 07:00 · Fire Ant Exploits VMware Flaws to Compromise ESXi Hosts and vCenter Environments - The Hacker News
TechTarget
Press · 19 Jan 2024, 08:00 · Chinese threat group exploited VMware vulnerability in 2021 - TechTarget
Rapid7
Press · 19 Jan 2024, 08:00 · Critical CVEs in Outdated Versions of Atlassian Confluence and VMware vCenter Server - Rapid7
See all 13 source documents
The Stack
Press · 19 Jan 2024, 08:00 · vCenter Server vulnerability went exploited for two years unnoticed. Attacks are ongoing - The Stack
Google Cloud
Press · 19 Jan 2024, 08:00 · Chinese Espionage Group UNC3886 Found Exploiting CVE-2023-34048 Since Late 2021 - Google Cloud
TechTarget
Press · 19 Jan 2024, 08:00 · Chinese threat group exploited VMware vulnerability in 2021 - TechTarget
Hong Kong Computer Emergency Response Team Coordination Centre
Press · 26 Oct 2023, 07:00 · VMware vCenter Server Multiple Vulnerabilities - Hong Kong Computer Emergency Response Team Coordination Centre
BleepingComputer
Press · 25 Oct 2023, 07:00 · VMware fixes critical code execution flaw in vCenter Server - BleepingComputer
Arctic Wolf
Press · 25 Oct 2023, 07:00 · Recommendations for CVE-2023-34048 - Arctic Wolf
Help Net Security
Press · 25 Oct 2023, 07:00 · VMware patches critical vulnerability in vCenter Server (CVE-2023-34048) - Help Net Security
SecurityWeek
Press · 25 Oct 2023, 07:00 · VMware vCenter Flaw So Critical, Patches Released for End-of-Life Products - SecurityWeek

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 9.0 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 9.8; EPSS 99.2%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:55.035007+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
25 Oct 2023, 04:21
First press mention
25 Oct 2023, 07:00
Added to the CISA KEV catalog
22 Jan 2024, 00:00
Latest press mention
11 Feb 2026, 08:00
Score calculated
05 Nov 2026, 13:58