CVE-2022-44420Network attack vector

Service interruption via unverified HashMME value

Published May 9, 2023 · Updated Jan 28, 2025

Insufficient HashMME verification in UNISOC modem firmware allows remote attackers to interrupt modem service via an LTE message. The modem accepts a Security Mode Command without validating its HashMME against the hash of the earlier Attach or Tracking Area Update Request. Remote attackers require access to LTE network signaling; the documented consequence is availability loss, while crash and recovery behavior remain undisclosed.

CVSS severity4.0
Medium
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient HashMME verification in UNISOC modem firmware allows remote attackers to interrupt modem service via an LTE message. The modem accepts a Security Mode Command without validating its HashMME against the hash of the earlier Attach or Tracking Area Update Request. Remote attackers require access to LTE network signaling; the documented consequence is availability loss, while crash and recovery behavior remain undisclosed.

The record

CVE
CVE-2022-44420
Published
May 9, 2023
Updated
Jan 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, CWE-345, T1642
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2025Record 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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0UNISOCCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-345Insufficient Verification of Data Authenticity
T1642Endpoint 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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