CVE-2025-58107
Published: 02 March 2026
Summary
CVE-2025-58107 is a high-severity Cleartext Transmission of Sensitive Information (CWE-319) vulnerability in Medium (inferred from references). Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 5.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 CM-6 (Configuration Settings) and SC-8 (Transmission Confidentiality and Integrity).
Deeper analysis
CVE-2025-58107 affects Microsoft Exchange servers through 2019, specifically Exchange ActiveSync (EAS) configurations on on-premises servers. The vulnerability causes sensitive data from Samsung mobile devices to be transmitted in cleartext during communication, exposing the user's name, e-mail address, device ID, bearer token, and base64-encoded password. Classified as CWE-319 (Cleartext Transmission of Sensitive Information), it has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), highlighting high confidentiality impact from network-accessible exploitation.
Any attacker positioned to observe network traffic between a Samsung mobile device and the vulnerable Exchange server can exploit this issue through passive eavesdropping, requiring no privileges, user interaction, or special access. Successful interception yields the cleartext sensitive data, enabling credential theft, token misuse for authentication bypass, or further attacks such as account takeover and lateral movement within the organization's email environment.
A detailed technical analysis of the vulnerability is provided in the referenced Medium article at https://geochen.medium.com/microsoft-activesync-legacy-protocol-plaintext-credential-and-token-exposure-vulnerability-b0fad89014fa, published alongside the CVE on 2026-03-02. Security practitioners should review it for implementation specifics and mitigation guidance, as no official patch details are included in the core CVE information.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-208168
Vulnerability details
In Microsoft Exchange through 2019, Exchange ActiveSync (EAS) configurations on on-premises servers may transmit sensitive data from Samsung mobile devices in cleartext, including the user's name, e-mail address, device ID, bearer token, and base64-encoded password.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Cleartext transmission of credentials/tokens directly enables passive network sniffing (T1040) to obtain unsecured credentials (T1552) for theft and subsequent account access.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SC-8 requires protection of the confidentiality of transmitted information, directly preventing cleartext transmission of sensitive data like credentials and tokens in Exchange ActiveSync communications.
CM-6 mandates secure configuration settings for system components, addressing the EAS configuration vulnerability that allows cleartext transmission from Samsung devices.
AC-19 enforces connection requirements and usage restrictions for mobile devices, enabling controls like mandatory encryption for Samsung devices accessing Exchange ActiveSync.