How severe is CVE-2021-25466?

CVE-2021-25466 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-25466 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25466?

CVE-2021-25466 affects Samsung Internet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25466?

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

When was CVE-2021-25466 published?

CVE-2021-25466 was published on 2021-09-09 and last updated on 2026-06-17.

CVE-2021-25466

CVE-2021-25466 is a medium-severity vulnerability in Samsung Internet 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Samsung Internet
Published: 2021-09-09
Last modified: 2026-06-17

Description

Improper scheme check vulnerability in Samsung Internet prior to version 15.0.2.47 allows attackers to perform Man-in-the-middle attack and obtain Samsung Account token.

Frequently asked questions

What is CVE-2021-25466?: Improper scheme check vulnerability in Samsung Internet prior to version 15.0.2.47 allows attackers to perform Man-in-the-middle attack and obtain Samsung Account token.
How severe is CVE-2021-25466?: CVE-2021-25466 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-25466 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25466?: CVE-2021-25466 affects Samsung Internet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25466?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25466 published?: CVE-2021-25466 was published on 2021-09-09 and last updated on 2026-06-17.

References

https://security.samsungmobile.com/serviceWeb.smsb?year=2021&month=9

Affected products (1)

cpe:2.3:a:samsung:internet:*:*:*:*:*:*:*:*

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