How severe is CVE-2026-21004?

CVE-2026-21004 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 none, integrity none, and availability high.

Is CVE-2026-21004 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21004?

CVE-2026-21004 affects Samsung Smart Switch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21004?

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

Does CVE-2026-21004 have an EU (EUVD) identifier?

Yes. CVE-2026-21004 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12323.

When was CVE-2026-21004 published?

CVE-2026-21004 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-21004

CVE-2026-21004 is a medium-severity vulnerability in Samsung Smart Switch 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 v4: 6.9
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12323
Weakness: CWE-287
Affected product: Samsung Smart Switch
Published: 2026-03-16
Last modified: 2026-06-17

Description

Improper authentication in Smart Switch prior to version 3.7.69.15 allows adjacent attackers to trigger a denial of service.

Frequently asked questions

What is CVE-2026-21004?: Improper authentication in Smart Switch prior to version 3.7.69.15 allows adjacent attackers to trigger a denial of service.
How severe is CVE-2026-21004?: CVE-2026-21004 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 none, integrity none, and availability high.
Is CVE-2026-21004 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21004?: CVE-2026-21004 affects Samsung Smart Switch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21004?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21004 have an EU (EUVD) identifier?: Yes. CVE-2026-21004 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12323.
When was CVE-2026-21004 published?: CVE-2026-21004 was published on 2026-03-16 and last updated on 2026-06-17.

References

https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=03

Affected products (1)

cpe:2.3:a:samsung:smart_switch:*:*:*:*:*:*:*:*

More vulnerabilities in Samsung Smart Switch

CVE-2026-20998 — Critical (CVSS 9.8): Improper authentication in Smart Switch prior to version 3.7.69.15 allows remote attackers to bypass authentication.
CVE-2026-20997 — Critical (CVSS 9.8): Improper verification of cryptographic signature in Smart Switch prior to version 3.7.69.15 allows remote attackers to…
CVE-2025-21078 — High (CVSS 8.8): Use of insufficiently random value of secretKey in Smart Switch prior to version 3.7.68.6 allows adjacent attackers to…
CVE-2025-21064 — High (CVSS 8.8): Improper authentication in Smart Switch prior to version 3.7.66.6 allows adjacent attackers to access transferring data.
CVE-2025-21062 — High (CVSS 7.8): Use of a broken or risky cryptographic algorithm in Smart Switch prior to version 3.7.67.2 allows local attackers to…
CVE-2026-20999 — High (CVSS 7.5): Authentication bypass by replay in Smart Switch prior to version 3.7.69.15 allows remote attackers to trigger…

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →