CVE-2021-43187Network attack vector

Sensitive information disclosure via iOS client cache

Published Nov 9, 2021 · Updated Aug 4, 2024

Sensitive information exposure in JetBrains YouTrack Mobile before 2021.2 allows attackers to read cached data on iOS devices. The iOS client stores sensitive YouTrack information in its client-side cache, where the operating system can retain it beyond immediate application use. Exploitation requires access to cached application data on an affected iOS device; the vendor has not identified the cached fields or access path.

CVSS severity5.3
Medium
EPSS probability0.79%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in JetBrains YouTrack Mobile before 2021.2 allows attackers to read cached data on iOS devices. The iOS client stores sensitive YouTrack information in its client-side cache, where the operating system can retain it beyond immediate application use. Exploitation requires access to cached application data on an affected iOS device; the vendor has not identified the cached fields or access path.

The record

CVE
CVE-2021-43187
Published
Nov 9, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-524, T1533
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 2021CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-524Use of Cache Containing Sensitive Information
T1533Data 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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