CVE-2020-4803

Local information disclosure via cached web pages

Published Sep 23, 2021 · Updated Sep 17, 2024

Information disclosure in IBM Edge 4.2 allows local users to read web pages retained by another account in a shared local cache. IBM identifies cache control as the affected locus but does not disclose which responses lack or misuse caching directives. Access requires another account on the same system, and the documented consequence is limited to reading locally stored page content.

CVSS severity3.3
Low
EPSS probability0.25%
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 IBM Edge 4.2 allows local users to read web pages retained by another account in a shared local cache. IBM identifies cache control as the affected locus but does not disclose which responses lack or misuse caching directives. Access requires another account on the same system, and the documented consequence is limited to reading locally stored page content.

The record

CVE
CVE-2020-4803
Published
Sep 23, 2021
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-922, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.5IBMCVSS:3.0/UI:N/S:U/I:N/PR:N/AC:L/C:L/A:N/AV:L/RC:C/RL:O/E:U
4.0IBMCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.3NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.1NVDAV:L/AC:L/Au:N/C:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-922Insecure Storage of Sensitive Information
T1005Data from Local System

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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