CVE-2023-39392Network attack vector

OsuLogin overwrite via insecure signature verification

Published Aug 13, 2023 · Updated Oct 10, 2024

Improper signature verification in the OsuLogin module in Huawei HarmonyOS and EMUI allows remote attackers to overwrite OsuLogin. Huawei identifies insecure signatures but does not disclose which signature input or verification operation is mishandled. No authentication or user interaction is required over the network; exploitation modifies the module without reported confidentiality or availability impact.

CVSS severity7.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in the OsuLogin module in Huawei HarmonyOS and EMUI allows remote attackers to overwrite OsuLogin. Huawei identifies insecure signatures but does not disclose which signature input or verification operation is mishandled. No authentication or user interaction is required over the network; exploitation modifies the module without reported confidentiality or availability impact.

The record

CVE
CVE-2023-39392
Published
Aug 13, 2023
Updated
Oct 10, 2024
Vendor
Huawei Technologies Co., Ltd.
Product
HarmonyOS
Classifications
CWE-16, CWE-347, T1553.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.1
  2. Affected versionversion=3.0.0
  3. Affected versionversion=3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Huawei Technologies Co., Ltd. · HarmonyOSversion=2.0.1; version=3.0.0; version=3.1.0
MindSpore · EMUIversion=12.0.1; version=13.0.0

Published CVSS scores

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

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-16Configuration
CWE-347Improper Verification of Cryptographic Signature
T1553.006Subvert Trust Controls: Code Signing Policy Modification

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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