CVE-2025-21035VulnerabilityPublished 3 Sep 2025

CVE-2025-21035: Samsung Calendar · Improper Access Control

Affects Samsung CalendarSource CVE Database V5

Not known to be exploited · CVSS 4.6 Medium : upgrade to 12.6.01.12 or 12.5.06.5 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

4.6Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 12.6.01.12, 12.5.06.5

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Physical
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Physical: The attack requires the attacker to physically touch or manipulate the vulnerable component. Physical interaction may be brief or persistent.
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Samsung Calendar to 12.6.01.12 or 12.5.06.5.

Affected software

Product	Affected	Fixed in
Samsung Mobile Samsung Calendar	Affected <12.5.06.5 <12.6.01.12	Fixed in 12.5.06.5 12.6.01.12

AI-suggested

2) Restrict or disable multiple user profiles on corporate Samsung devices where possible to reduce the attack surface. 3) Enforce strict physical security controls to prevent unauthorized physical access to devices, including screen locks with strong authentication and secure storage policies. 4) Use Mobile Device Management (MDM) solutions to monitor device configurations and enforce security policies that limit profile sharing and access. 5) Educate employees about the risks of sharing devices or profiles and the importance of reporting lost or stolen devices promptly. 6) Consider encrypting sensitive calendar data or using alternative secure calendar applications if patching is delayed. 7) Conduct regular audits of device usage and access logs to detect any unauthorized access attempts. These steps go beyond generic advice by focusing on controlling multi-user environments and physical access, which are key to this vulnerability.

Description

Improper access control in Samsung Calendar prior to version 12.5.06.5 in Android 14 and 12.6.01.12 in Android 15 allows physical attackers to access data across multiple user profiles.

Impact

For European organizations, this vulnerability poses a privacy and confidentiality risk primarily in scenarios where Samsung mobile devices are shared among multiple users or used in environments with multiple user profiles, such as corporate devices with guest or secondary profiles. Exposure of calendar data could lead to leakage of sensitive meeting schedules, business plans, or personal appointments, potentially aiding social engineering or targeted attacks. While the vulnerability does not allow remote exploitation or modification of data, the confidentiality breach could undermine trust in device security and compliance with data protection regulations such as GDPR, especially if personal data of employees or clients is exposed. Organizations with mobile device management (MDM) policies that permit multiple user profiles on Samsung devices should be particularly cautious. The impact is more pronounced in sectors handling sensitive or confidential information, including government, finance, healthcare, and critical infrastructure within Europe. However, the requirement for physical access limits the threat to insider attacks or theft scenarios rather than remote cyberattacks.

CWE-284Improper Access Control (opens in a new tab)
Pillar weaknessCWE Top 25 (2025): #19OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Operation
Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
Architecture and Design · Separation of Privilege
Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
OWASP Cheat Sheets
Docker Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
Virtual Patching (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V1.4.4 (opens in a new tab)
V1.4.5 (opens in a new tab)
V1.10.1 (opens in a new tab)
Attack patterns
Embedding Scripts within Scripts (opens in a new tab)
Modification of Windows Service Configuration (opens in a new tab)
Malicious Root Certificate (opens in a new tab)
Intent Spoof (opens in a new tab)
WebView Exposure (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

security.samsungmobile.com/serviceWeb.smsb?year=2025&month=09 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Sep 2025, 06:34 UTC

WeaknessesCWE-284

Technical details

References

Community reviews

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