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CVE-2019-5961

22
FAUCET Score

CVE-2019-5961 describes a critical vulnerability in the Android application 'Tootdon for Mastodon' version 3.4.1 and earlier, where the app fails to properly validate X.509 certificates from SSL servers. This flaw enables man-in-the-middle (MitM) attackers to spoof legitimate servers using crafted certificates, potentially leading to the compromise of sensitive user information. With a CVSS score of 7.4 (High), the vulnerability is network-exploitable with high impact on confidentiality and integrity, though it requires high attack complexity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.4.1CPE matchmatch criteria
cpe:2.3:a:mastodon-tootdon:tootdon_for_mastodon:*:*:*:*:*:android:*:*

CVSS Data

CVSS version used by this source: 3.0

7.4HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.64%
Probability of exploitation in next 30 days
EPSS Percentile
47.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0064 is in the 18th percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.mastodon-tootdon.com / entry/2019/05/20/204019
Vendor Advisory
jvn.jp / en/jp/JVN57806517/index.html
Third Party Advisory