CVE-2021-31196

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS 7.2 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.4/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 7.2: +1.08
Fresh EPSS: 54.06%: +0.27

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

Sources: 5 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

Security Affairs

Press · 22 Aug 2024, 07:00 · U.S. CISA adds Dahua IP Camera, Linux Kernel and Microsoft Exchange Server bugs to its Known Exploited Vuln... - Security Affairs

Arctic Wolf

Press · 03 Sep 2021, 07:00 · ProxyToken: Authentication Bypass Vulnerability in On-Premises Microsoft Exchange - Arctic Wolf

CrowdStrike.com

Press · 15 Jul 2021, 07:00 · July 2021 Patch Tuesday: Updates and Analysis - CrowdStrike.com

TechTarget

Press · 14 Jul 2021, 07:00 · 3 Windows zero-days fixed on July Patch Tuesday - TechTarget

thezdi.com

Press · 13 Jul 2021, 07:00 · The July 2021 Security Update Review - thezdi.com

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 8.4 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

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 7.2; EPSS 54.1%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network access, high 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 13:58:26.907878+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

First press mention

13 Jul 2021, 07:00

Published

14 Jul 2021, 17:53

Added to the CISA KEV catalog

21 Aug 2024, 00:00

Latest press mention

22 Aug 2024, 07:00

Score calculated

05 Nov 2026, 13:58