October 13, 2026

CVE Watchtower

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CVE-2021-31207NVD

Vulnerability Summary

No description available
Severity Level
MEDIUM(6.6)
Published Date
May 11, 2021
Last Modified
Oct 21, 2025
PoC
Available(Metasploit)
Exploitation Status
ACTIVE
EPSS Score (30-Day)
Data Pending
Root Weakness (CWE)
N/A
CVSS v3.1 Base Metrics — Score 6.6 (MEDIUM)
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 >= 15.00.0 and < 15.00.1497.018
  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 9 >= 15.02.0 and < 15.02.0858.012
  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 20 >= 15.01.0 and < 15.01.2242.010
  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 >= 15.01.0 and < 15.01.2176.014
  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 >= 15.02.0 and < 15.02.0792.015
Patched Versions
  • Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.018
  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 9 15.02.0858.012
  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 20 15.01.2242.010
  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.2176.014
  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0792.015
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💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫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