Which versions of Jwt Attack are affected by CVE-2026-20997?

Organizations using Smart Switch should be aware of moderate risk from CVE-2026-20997 rated CVSS 5.3. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-20997?

Within 30 days: Identify affected systems running Smart Switch and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Jwt Attack CVE-2026-20997

Q: What is the CVSS score of CVE-2026-20997?

CVE-2026-20997 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

EUVD-2026-12311 MEDIUM

Improper Verification of Cryptographic Signature (CWE-347)

2026-03-16 SamsungMobile

Authentication Bypass Jwt Attack

5.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

EUVD ID Assigned

Mar 16, 2026 - 05:00 euvd

EUVD-2026-12311

Analysis Generated

Mar 16, 2026 - 05:00 vuln.today

CVE Published

Mar 16, 2026 - 04:32 nvd

MEDIUM 5.3

DescriptionCVE.org

Improper verification of cryptographic signature in Smart Switch prior to version 3.7.69.15 allows remote attackers to potentially bypass authentication.

AnalysisAI

Smart Switch prior to version 3.7.69.15 contains an improper cryptographic signature verification vulnerability that allows remote attackers to bypass authentication mechanisms. The vulnerability has a CVSS score of 5.3 with network-based attack vector and low complexity, requiring only user interaction. While no public exploit or KEV status has been confirmed, the authentication bypass capability presents a moderate risk for unauthorized access to affected devices.

Technical ContextAI

This vulnerability stems from a failure to properly validate cryptographic signatures, which are fundamental security controls for verifying the authenticity and integrity of messages or software components. The affected product, Smart Switch, likely uses signature verification as part of its authentication or firmware validation processes. The improper implementation allows attackers to craft malicious requests or payloads that pass signature checks despite being unsigned or incorrectly signed. CWE mapping to signature verification failures (CWE-347: Improper Verification of Cryptographic Signature) indicates the root cause is insufficient or missing validation logic in the cryptographic signature verification routine. Smart Switch versions before 3.7.69.15 are vulnerable; the exact CPE string for this product would be cpe:2.3:a:vendor:smart_switch:*:*:*:*:*:*:*:* with version constraint prior to 3.7.69.15.

RemediationAI

Immediately upgrade Smart Switch to version 3.7.69.15 or later, which patches the cryptographic signature verification flaw. Users should visit Samsung's official support portal or use the automatic update mechanism within Smart Switch to deploy the patched version. Until patching is complete, restrict network access to Smart Switch instances through firewall rules, disable remote management features if not required, and implement network segmentation to limit the blast radius of potential authentication bypass exploitation. Monitor authentication logs for suspicious sign-in attempts or unauthorized configuration changes.