CVE-2020-1058Network attack vector

Current-user code execution via object memory corruption

Published May 21, 2020 · Updated Aug 19, 2026

Memory corruption in Microsoft's VBScript engine used by Internet Explorer 9 and 11 allows remote attackers to execute code as the current user. The engine mishandles objects in memory while processing crafted script content; Microsoft has not disclosed the specific object operation or narrower code locus. Exploitation requires a user to open attacker-controlled web content or a document hosting the IE engine, and administrative users expose the entire system.

CVSS severity7.5
High
EPSS probability3.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Microsoft's VBScript engine used by Internet Explorer 9 and 11 allows remote attackers to execute code as the current user. The engine mishandles objects in memory while processing crafted script content; Microsoft has not disclosed the specific object operation or narrower code locus. Exploitation requires a user to open attacker-controlled web content or a document hosting the IE engine, and administrative users expose the entire system.

The record

CVE
CVE-2020-1058
Published
May 21, 2020
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Internet Explorer 11
Classifications
CWE-787, T1189, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <publication

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Internet Explorer 11version=1.0.0 <publication
Microsoft · Internet Explorer 9version=1.0.0 <publication

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.6NIST National Vulnerability DatabaseAV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1189Drive-by Compromise
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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