CVE-2025-71253Network attack vector

Remote denial of service via improper IMS validation

Published May 6, 2026 · Updated May 6, 2026

Improper input validation in Unisoc Modem IMS on chipsets running Android 13 through 16 allows remote attackers to cause denial of service. Unisoc has not disclosed which IMS input is mishandled or which validation operation is missing in the modem component. Network reachability requires no authentication, privileges, or user interaction, and successful exploitation interrupts service availability.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Unisoc Modem IMS on chipsets running Android 13 through 16 allows remote attackers to cause denial of service. Unisoc has not disclosed which IMS input is mishandled or which validation operation is missing in the modem component. Network reachability requires no authentication, privileges, or user interaction, and successful exploitation interrupts service availability.

The record

CVE
CVE-2025-71253
Published
May 6, 2026
Updated
May 6, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5UnisocCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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