CVE-2021-27204Public exploit

Local passcode disclosure via cleartext storage

Published Feb 12, 2021 · Updated Aug 3, 2024

Cleartext storage in Telegram Stable for macOS before 7.4 build 212543 allows local users to read the configured local passcode. The macOS client persists the local passcode without encryption, but public sources do not identify the backing file or preference key. Exploitation requires local access to the affected macOS account and reveals only the application passcode, with no reported message access or modification.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext storage in Telegram Stable for macOS before 7.4 build 212543 allows local users to read the configured local passcode. The macOS client persists the local passcode without encryption, but public sources do not identify the backing file or preference key. Exploitation requires local access to the affected macOS account and reveals only the application passcode, with no reported message access or modification.

The record

CVE
CVE-2021-27204
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-312, T1552
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

2.1NISTAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552Unsecured Credentials

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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