How severe is CVE-2025-21083?

CVE-2025-21083 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-21083 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21083?

CVE-2025-21083 affects Mattermost Mattermost Mobile. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-21083?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-21083 have an EU (EUVD) identifier?

Yes. CVE-2025-21083 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2220.

When was CVE-2025-21083 published?

CVE-2025-21083 was published on 2025-01-15 and last updated on 2026-06-17.

CVE-2025-21083

CVE-2025-21083 is a medium-severity vulnerability in Mattermost Mattermost Mobile with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2220
Weakness: CWE-1287
Affected product: Mattermost Mattermost Mobile
Published: 2025-01-15
Last modified: 2026-06-17

Description

Mattermost Mobile Apps versions <=2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Frequently asked questions

What is CVE-2025-21083?: Mattermost Mobile Apps versions <=2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
How severe is CVE-2025-21083?: CVE-2025-21083 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-21083 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21083?: CVE-2025-21083 affects Mattermost Mattermost Mobile. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-21083?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-21083 have an EU (EUVD) identifier?: Yes. CVE-2025-21083 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2220.
When was CVE-2025-21083 published?: CVE-2025-21083 was published on 2025-01-15 and last updated on 2026-06-17.

References

https://mattermost.com/security-updates

Affected products (1)

cpe:2.3:a:mattermost:mattermost_mobile:*:*:*:*:*:*:*:*

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