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PatchSiren cyber security CVE debrief

CVE-2018-25239 SmartVPN CVE debrief

CVE-2018-25239 is a denial of service vulnerability in Smart VPN 1.1.3.0. Local attackers can crash the application by submitting oversized input through the search interface. An unhandled exception occurs when a buffer of 2100 characters is pasted into the top right search bar, causing the application to crash. This vulnerability has a CVSS score of 6.9 and a MEDIUM severity level. Users should review the official advisory for specific guidance on affected versions and remediation steps.

Vendor
SmartVPN
Product
Smart VPN
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-04
Original CVE updated
2026-07-21
Advisory published
2026-04-04
Advisory updated
2026-07-21

Who should care

Users of Smart VPN 1.1.3.0, particularly those responsible for maintaining and securing network infrastructure, should be aware of this vulnerability and take steps to mitigate it. This includes reviewing system logs for abnormal behavior and ensuring that appropriate security measures are in place.

Technical summary

The vulnerability exists in the search interface of Smart VPN 1.1.3.0. When a buffer of 2100 characters is submitted, an unhandled exception is triggered, causing the application to crash. The CVSS vector for this vulnerability is CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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. This information is based on the provided CVE record and NVD details.

Defensive priority

This vulnerability has a medium severity level and a local attack vector, making it a priority for users of Smart VPN 1.1.3.0 to address. Defensive measures should focus on restricting access to the search interface and monitoring the application for abnormal behavior.

Recommended defensive actions

  • Apply the vendor's remediation for Smart VPN 1.1.3.0
  • Restrict access to the search interface
  • Monitor the application for abnormal behavior
  • Consider using compensating controls
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-04T14:16:19.293Z and was last modified on 2026-07-21T07:10:00.117Z. The NVD entry is currently Deferred. This information is based on the provided source corpus. Further verification is recommended to confirm affected scope and severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-25239 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-25239

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2018-25239 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-25239

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.