major vulnerability· requires attention

Qualcomm components are widely deployed in smartphones and embedded devices; unauthenticated RCE could enable broad device compromise and supply-chain impact.

Mobile

CVE-2026-25254

9.8

Critical

EPSS 0.47%Patch available

Unauthenticated RCE via Socket.IO in Qualcomm components (CVE-2026-25254)

exploited

No known exploitation not in CISA KEV as of our last sync

fix

Patch available see the advisory in the references

likelihood

EPSS 0.47%top 60% of scored CVEs

Published 22 Sept 2026Analysed here 23 Sept 2026CVSS scored by the publisher (CNA)

common questions

Is CVE-2026-25254 being exploited?

Not confirmed. CVE-2026-25254 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.47% probability of exploitation in the next 30 days.

How severe is CVE-2026-25254?

CVE-2026-25254 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-25254?

Yes. A fix has been recorded for CVE-2026-25254. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-25254 affect?

CVE-2026-25254 affects Qualcomm SoC/firmware with Socket.IO service, Smartphones using affected Qualcomm components, Embedded devices/IoT using affected Qualcomm modules. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-25254?

Apply vendor bulletin mitigations/patches and restrict Socket.IO exposure

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

Qualcomm SoC/firmware with Socket.IO serviceSmartphones using affected Qualcomm componentsEmbedded devices/IoT using affected Qualcomm modules

impact

Remote code execution through an improperly authorized Socket.IO interface, enabling full device compromise, persistence, and remote control.

action required

Immediate action required

affected versions

Qualcomm, Inc. Snapdragon

affectedQSCv1.17.1
affectedQSCv1.19.1
affectedQSCv1.21.0

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

cisa ssvc

exploitation: none
automatable: yes
technical impact: total

Assessed by CISA 22 Sept 2026 (SSVC 2.0.3).

timeline

22 Sept 2026Published
22 Sept 2026CISA SSVC assessment: exploitation none · same day later
22 Sept 2026CVE record last updated · same day later
23 Sept 2026Analysed by vulneraibility.com · 1 day later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

1 reference in the CVE record: 1 link

Linkdocs.qualcomm.com /product/publicresources/securitybulletin/may-2026-bulletin.html

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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