How severe is CVE-2021-25437?

CVE-2021-25437 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25437 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25437?

CVE-2021-25437 affects Linux Tizen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25437?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-25437 published?

CVE-2021-25437 was published on 2021-07-08 and last updated on 2026-06-17.

CVE-2021-25437

CVE-2021-25437 is a critical-severity vulnerability in Linux Tizen with a CVSS 3.x base score of 9.8. 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Linux Tizen
Published: 2021-07-08
Last modified: 2026-06-17

Description

Improper access control vulnerability in Tizen FOTA service prior to Firmware update JUL-2021 Release allows attackers to arbitrary code execution by replacing FOTA update file.

Frequently asked questions

What is CVE-2021-25437?: Improper access control vulnerability in Tizen FOTA service prior to Firmware update JUL-2021 Release allows attackers to arbitrary code execution by replacing FOTA update file.
How severe is CVE-2021-25437?: CVE-2021-25437 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25437 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25437?: CVE-2021-25437 affects Linux Tizen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25437?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-25437 published?: CVE-2021-25437 was published on 2021-07-08 and last updated on 2026-06-17.

References

https://security.samsungmobile.com/serviceWeb.smsb?year=2021&month=7

Affected products (1)

cpe:2.3:o:linux:tizen:*:*:*:*:*:*:*:*

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