CVE-2025-34449Public exploit

Host crash via inverted device-message bounds check

Published Dec 18, 2025 · Updated Dec 18, 2025

Buffer overflow in Genymobile scrcpy 3.3.3 and earlier allows attackers to crash the host application through a connected device. In sc_device_msg_deserialize, an inverted UHID_OUTPUT payload-length comparison accepts a size larger than the buffered message, causing process_msgs to advance past the receiver buffer and sc_read32be to read out of bounds. Exploitation requires a compromised, emulated, or proxied device able to send crafted messages; only a host-process abort or crash has been demonstrated.

CVSS severity6.9
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Genymobile scrcpy 3.3.3 and earlier allows attackers to crash the host application through a connected device. In sc_device_msg_deserialize, an inverted UHID_OUTPUT payload-length comparison accepts a size larger than the buffered message, causing process_msgs to advance past the receiver buffer and sc_read32be to read out of bounds. Exploitation requires a compromised, emulated, or proxied device able to send crafted messages; only a host-process abort or crash has been demonstrated.

The record

CVE
CVE-2025-34449
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Genymobile
Product
scrcpy
Classifications
CWE-502, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 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?

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

  1. Affected versionversion=0 <=3.3.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Genymobile · scrcpyversion=0 <=3.3.3

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

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No observations available

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

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1499.004Application or System Exploitation

Public exploit references

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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