PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-27843 Raw CVE debrief

CVE-2026-27843 is a critical availability issue in SenseLive X3050 V1.523’s web management interface. According to CISA’s advisory, the interface permits critical configuration parameters to be changed without sufficient authentication or server-side validation. An attacker can apply disruptive values to recovery and network settings, driving the gateway into a persistent lockout state. Because the device has no physical reset button, recovery requires specialized console access for a factory reset, which can take the gateway and its connected RS-485 downstream systems offline.

Vendor
Raw
Product
SenseLive X3050 V1.523
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-21
Original CVE updated
2026-04-21
Advisory published
2026-04-21
Advisory updated
2026-04-21

Who should care

OT operators, plant engineers, integrators, and asset owners using SenseLive X3050 gateways should treat this as urgent. It is especially relevant where the gateway supports downstream RS-485 equipment or where console access for recovery is difficult or delayed.

Technical summary

The advisory describes a web management weakness that allows unauthorized modification of sensitive configuration values due to insufficient authentication and server-side validation. The impact is primarily denial of service: unsupported or disruptive settings can force a persistent lockout, and recovery is not possible through a simple local reset because the device lacks a physical reset button. The only documented recovery path is specialized technical access via the console to perform a factory reset. CISA also notes that SenseLive did not respond to coordination requests.

Defensive priority

Immediate

Recommended defensive actions

  • Treat affected SenseLive X3050 V1.523 devices as high priority for inventory and exposure review.
  • Restrict access to the web management interface to trusted administrative networks only.
  • Apply any vendor guidance or fix from SenseLive as soon as it becomes available; CISA indicates the vendor did not respond to coordination requests in the advisory.
  • Plan and test console-based recovery procedures before an incident occurs, since the device does not have a physical reset button.
  • Review downstream RS-485 dependencies so a gateway lockout does not create an unexpected operational outage.
  • Use CISA industrial control systems recommended practices to harden management access and reduce the impact of unauthorized configuration changes.

Evidence notes

This debrief is based on CISA’s CSAF advisory ICSA-26-111-12 for CVE-2026-27843, published 2026-04-21 and last modified 2026-04-21. The source states that the web management interface allows critical configuration changes without sufficient authentication or server-side validation, that disruptive values can induce a persistent lockout, and that recovery requires console access for a factory reset. The advisory also states that SenseLive did not respond to CISA’s coordination requests. The CVSS vector supplied in the source is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H with a severity of Critical.

Official resources

CISA published the advisory and source record on 2026-04-21. This debrief uses the advisory’s published and modified timestamps as the timing basis for the issue.