October 13, 2026

CVE Watchtower

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CVE-2021-34523NVD

Vulnerability Summary

Microsoft Exchange Server Elevation of Privilege Vulnerability
Severity Level
CRITICAL(9.0)
Published Date
Jul 14, 2021
Last Modified
Aug 10, 2026
PoC
Available(Metasploit)
Exploitation Status
ACTIVE
EPSS Score (30-Day)
99.99%Probability
Root Weakness (CWE)
N/A
CVSS v3.1 Base Metrics — Score 9.0 (CRITICAL)
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Microsoft Exchange Server
Patched Versions
Not provided by NVD for this CVE.
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🚫Ad-Free — Uninterrupted experience.
🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References