CVE-2020-3841Public exploitNetwork attack vector

Credential disclosure via captive-portal AutoFill confusion

Published Feb 27, 2020 · Updated Aug 4, 2024

Credential disclosure in iOS before 13.3.1 and Safari before 13.0.5 allows local users to expose saved passwords via a captive portal. Safari Login AutoFill confuses captive.apple.com with iCloud credential scope and offers saved iCloud credentials inside an automatically opened HTTP captive-login frame. A user must join an attacker-controlled Wi-Fi network and select the offered credentials; the phishing page then submits them before login confirmation.

CVSS severity6.5
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential disclosure in iOS before 13.3.1 and Safari before 13.0.5 allows local users to expose saved passwords via a captive portal. Safari Login AutoFill confuses captive.apple.com with iCloud credential scope and offers saved iCloud credentials inside an automatically opened HTTP captive-login frame. A user must join an attacker-controlled Wi-Fi network and select the offered credentials; the phishing page then submits them before login confirmation.

The record

CVE
CVE-2020-3841
Published
Feb 27, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-319, CWE-522, T1056.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <iOS 13.3.1 and iPadOS 13.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <iOS 13.3.1 and iPadOS 13.3.1
Apple · Safariversion=unspecified <Safari 13.0.5

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-319Cleartext Transmission of Sensitive Information
CWE-522Insufficiently Protected Credentials
T1056.003Input Capture: Web Portal Capture

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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