Android App "Tootdon for Mastodon" fails to verify SSL server certificates


Android App "Tootdon for Mastodon" provided by Tsukurito, Inc. fails to verify SSL server certificates (CWE-295).

Gomasy reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.8 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

Tsukurito, Inc.
  • Tootdon for Mastodon Android App version 3.4.1 and earlier


A man-in-the-middle attack may allow an attacker to obtain and/or alter a content of communication.

[Update the Application]
Update to the latest version according to the information provided by the developer.
Vendor Information

Tsukurito, Inc.
  • Tsukurito, Inc. : Tootdon for Mastodon (An English version is following after the Japanese version)
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2019-5961

  1. JVN : JVN#57806517
  2. National Vulnerability Database (NVD) : CVE-2019-5961
Revision History

  • [2019/05/24]
      Web page was published
  • [2019/10/04]
      References : Content was added