CVE-2020-6442Public exploitNetwork attack vector

Cross-origin data disclosure via cache-size difference

Published Apr 13, 2020 · Updated Aug 4, 2024

Information disclosure in Google Cloud Google Chrome before 81.0.4044.92 allows remote attackers to leak cross-origin data via crafted HTML. The cache quota accounting exposes aggregate size growth without isolating origins, so loading two cross-origin documents reveals their size difference. Exploitation requires a user to visit a crafted page, and disclosure is limited to information inferable from cross-origin response sizes.

CVSS severity4.3
Medium
EPSS probability1.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Google Cloud Google Chrome before 81.0.4044.92 allows remote attackers to leak cross-origin data via crafted HTML. The cache quota accounting exposes aggregate size growth without isolating origins, so loading two cross-origin documents reveals their size difference. Exploitation requires a user to visit a crafted page, and disclosure is limited to information inferable from cross-origin response sizes.

The record

CVE
CVE-2020-6442
Published
Apr 13, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-668, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 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 <81.0.4044.92

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <81.0.4044.92

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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 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 exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1189Drive-by Compromise

Public exploit references

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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