Vulnerability

CVE-2018-8373

High· 7.5KEVCVSS7.5EPSS82%

.rules3/5

Microsoft Scripting Engine Memory Corruption Vulnerability

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer.

Threat signal

97/100

Severe

Severity

high

CVSS

7.5

EPSS

82%

Active

KEV

CISA KEV — actively exploited

1520d overdue

AffectedMicrosoft — Internet Explorer Scripting Engine

Added to KEV

2022-03-25

Federal patch due (BOD 22-01)

2022-04-15

Required action (CISA verbatim)

Apply updates per vendor instructions.

Vendor advisory + references

https://nvd.nist.gov/vuln/detail/CVE-2018-8373

CISA description: “A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer.”

CVSS

v3.1Open in FIRST calculator →

7.5/ 10HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityHighRequires conditions outside attacker's control (race, brute-force, configuration
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

82.5%

probability of exploitation in next 30 days

p99

higher than 99% of all CVEs

3-day trend↑ 0pp

Statistically about to be weaponized — top-tier triage urgency.

Vendor VEX

No VEX statements published for CVE-2018-8373. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: no
impact: total
mission: support

Lifecycle

2022-03-25Added to CISA KEVransomware: Unknown
2022-03-25Published
2022-04-15Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.