Page generated: 09 Nov 2026, 09:02 UTC
CVE-2023-21529
Microsoft Exchange Server Remote Code Execution Vulnerability
CVSS 8.8 (HIGH) KEV: KNOWN CATALOG
Attention and evidence
HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.6/10
General review priority; not probability
Evidence confidence: Exploitation recorded
Sources: 11 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
Recorded Future
Press · 15 May 2026, 07:00 · April 2026 CVE Landscape - Recorded Future
The Hacker News
Press · 14 Apr 2026, 07:00 · CISA Adds 6 Known Exploited Flaws in Fortinet, Microsoft, and Adobe Software - The Hacker News
The Register
Press · 13 Apr 2026, 07:00 · Ransomware scum, other crims exploit 4 old Microsoft bugs - The Register
The Hacker News
Press · 07 Apr 2026, 07:00 · China-Linked Storm-1175 Exploits Zero-Days to Rapidly Deploy Medusa Ransomware - The Hacker News
Microsoft
Press · 06 Apr 2026, 07:00 · Storm-1175 focuses gaze on vulnerable web-facing assets in high-tempo Medusa ransomware operations - Microsoft
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 8.6 (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 8.8; EPSS 59.3%
- Attention, last 30 days
- 0 distinct story titles; 0 press documents; 0 publisher domains.
- Technical potential
- network access, low 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 13:58:49.717973+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z
Source event timeline
First press mention
14 Feb 2023, 08:00
Published
14 Feb 2023, 19:33
Added to the CISA KEV catalog
13 Apr 2026, 00:00
Latest press mention
15 May 2026, 07:00
Score calculated
05 Nov 2026, 13:58