CVE-2020-0663Network attack vector

Cross-domain data access and injection via policy bypass

Published Feb 11, 2020 · Updated Aug 4, 2024

Cross-domain policy bypass in Microsoft Edge Legacy allows remote attackers to read and inject cross-origin data through a crafted website. The EdgeHTML-based browser fails to enforce its cross-domain boundary while processing attacker-controlled web content; Microsoft has not disclosed the affected function or exact policy-check error. Exploitation requires a user to visit the attacker-hosted site, and the reported impact is limited to cross-domain information access and content injection.

CVSS severity4.2
Medium
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-domain policy bypass in Microsoft Edge Legacy allows remote attackers to read and inject cross-origin data through a crafted website. The EdgeHTML-based browser fails to enforce its cross-domain boundary while processing attacker-controlled web content; Microsoft has not disclosed the affected function or exact policy-check error. Exploitation requires a user to visit the attacker-hosted site, and the reported impact is limited to cross-domain information access and content injection.

The record

CVE
CVE-2020-0663
Published
Feb 11, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Microsoft Edge Legacy
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge Legacyversion=unspecified

Published CVSS scores

4.0NIST NVDAV:N/AC:H/Au:N/C:P/I:P/A:N
4.2NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1189Drive-by Compromise

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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